New version of Telerik SDK examples.

Map/WPF/Map_WPF.sln

@@ -167,6 +167,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BingGeoDataAPI", "BingGeoDa
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MapShapeData", "MapShapeData\MapShapeData.csproj", "{B951808E-1800-49B1-8110-B8950F5B7B36}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ProvidersMapBoxMapProvider", "ProvidersMapBoxMapProvider\ProvidersMapBoxMapProvider.csproj", "{7A63213A-BAA5-4C09-A033-EFF57334B065}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -501,6 +503,10 @@ Global
 		{B951808E-1800-49B1-8110-B8950F5B7B36}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B951808E-1800-49B1-8110-B8950F5B7B36}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B951808E-1800-49B1-8110-B8950F5B7B36}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7A63213A-BAA5-4C09-A033-EFF57334B065}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7A63213A-BAA5-4C09-A033-EFF57334B065}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7A63213A-BAA5-4C09-A033-EFF57334B065}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7A63213A-BAA5-4C09-A033-EFF57334B065}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Map/WPF/ProvidersMapBoxMapProvider/App.xaml

@@ -0,0 +1,5 @@
+<Application x:Class="ProvidersMapBoxMapProvider.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:ProvidersMapBoxMapProvider"
+             StartupUri="MainWindow.xaml"/>

Map/WPF/ProvidersMapBoxMapProvider/App.xaml.cs

@@ -0,0 +1,8 @@
+using System.Windows;
+
+namespace ProvidersMapBoxMapProvider
+{
+    public partial class App : Application
+    {
+    }
+}

Map/WPF/ProvidersMapBoxMapProvider/MainWindow.xaml

@@ -0,0 +1,28 @@
+<Window x:Class="ProvidersMapBoxMapProvider.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:ProvidersMapBoxMapProvider"
+        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
+        mc:Ignorable="d"
+        Title="RadMap Providers - MapBoxMapProvider" Height="800" Width="1000">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <StackPanel Orientation="Horizontal" Margin="10">
+            <TextBlock Text="Input a valid " FontSize="16" VerticalAlignment="Center"/>
+            <telerik:RadHyperlinkButton Content="Mapbox access token" 
+                                        NavigateUri="https://docs.mapbox.com/help/glossary/access-token/" 
+                                        FontSize="16"/>
+            <TextBlock Text=":" FontSize="16" VerticalAlignment="Center"/>
+            <TextBox x:Name="mapBoxTokenInput" Width="500" Margin="10, 0" VerticalContentAlignment="Center"/>
+            <telerik:RadButton Click="Button_Click" Content="Activate" Padding="30 10" IsDefault="True"/>
+        </StackPanel>
+
+        <telerik:RadMap x:Name="map" Grid.Row="1" Margin="10" Background="#FAFAFC"/>
+    </Grid>
+</Window>

Map/WPF/ProvidersMapBoxMapProvider/MainWindow.xaml.cs

@@ -0,0 +1,23 @@
+using System.Windows;
+using Telerik.Windows.Controls;
+using Telerik.Windows.Controls.Map;
+
+namespace ProvidersMapBoxMapProvider
+{
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            StyleManager.ApplicationTheme = new FluentTheme();
+            InitializeComponent();
+        }
+
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            string accessToken = this.mapBoxTokenInput.Text;
+            MapBoxMapProvider provider = new MapBoxMapProvider();
+            provider.AccessToken = accessToken;
+            this.map.Provider = provider;            
+        }
+    }
+}

Map/WPF/ProvidersMapBoxMapProvider/Properties/AssemblyInfo.cs

@@ -0,0 +1,55 @@
+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("ProvidersMapBoxMapProvider")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Progress")]
+[assembly: AssemblyProduct("ProvidersMapBoxMapProvider")]
+[assembly: AssemblyCopyright("Copyright © Progress 2023")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+//In order to begin building localizable applications, set
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Map/WPF/ProvidersMapBoxMapProvider/Properties/Resources.Designer.cs

@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace ProvidersMapBoxMapProvider.Properties
+{
+
+
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources
+    {
+
+        private static global::System.Resources.ResourceManager resourceMan;
+
+        private static global::System.Globalization.CultureInfo resourceCulture;
+
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources()
+        {
+        }
+
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager
+        {
+            get
+            {
+                if ((resourceMan == null))
+                {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("ProvidersMapBoxMapProvider.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture
+        {
+            get
+            {
+                return resourceCulture;
+            }
+            set
+            {
+                resourceCulture = value;
+            }
+        }
+    }
+}

Map/WPF/ProvidersMapBoxMapProvider/Properties/Resources.resx

@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

Map/WPF/ProvidersMapBoxMapProvider/Properties/Settings.Designer.cs

@@ -0,0 +1,30 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace ProvidersMapBoxMapProvider.Properties
+{
+
+
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
+    {
+
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+
+        public static Settings Default
+        {
+            get
+            {
+                return defaultInstance;
+            }
+        }
+    }
+}

Map/WPF/ProvidersMapBoxMapProvider/Properties/Settings.settings

@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>

Map/WPF/ProvidersMapBoxMapProvider/ProvidersMapBoxMapProvider.csproj

@@ -0,0 +1,106 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{7A63213A-BAA5-4C09-A033-EFF57334B065}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>ProvidersMapBoxMapProvider</RootNamespace>
+    <AssemblyName>ProvidersMapBoxMapProvider</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\packages\Newtonsoft.Json.13.0.2\lib\net40\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Telerik.Windows.Controls">
+      <HintPath>$(TELERIKWPFDIR)\Binaries\WPF40\Telerik.Windows.Controls.dll</HintPath>
+    </Reference>
+    <Reference Include="Telerik.Windows.Data">
+      <HintPath>$(TELERIKWPFDIR)\Binaries\WPF40\Telerik.Windows.Data.dll</HintPath>
+    </Reference>
+    <Reference Include="Telerik.Windows.Controls.DataVisualization">
+      <HintPath>$(TELERIKWPFDIR)\Binaries\WPF40\Telerik.Windows.Controls.DataVisualization.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="System.Xaml">
+      <RequiredTargetFramework>4.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </ApplicationDefinition>
+    <Page Include="MainWindow.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="MainWindow.xaml.cs">
+      <DependentUpon>MainWindow.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+    <None Include="packages.config" />
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Map/WPF/ProvidersMapBoxMapProvider/Readme.md

@@ -0,0 +1,5 @@
+## Providers Mapbox Map Provider
+
+The RadMap control doesn't display a map on itself, it needs a map provider from which to consume the required data. This example demonstrates the MapBoxMapProvider which incorporates Mapbox vector tile services.
+
+[//]: <keywords:mapbox, vector, tiles, tileset>

Map/WPF/ProvidersMapBoxMapProvider/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net40" />
+</packages>

TreeView/EnableOnlyDropInsideItem/MainPage.xaml.cs

@@ -1,5 +1,7 @@
-using System;
+using EnableOnlyDropInsideItem.ViewModels;
+using System;
 using System.Linq;
+using System.Collections;
 using System.Windows.Controls;
 using Telerik.Windows.Controls.TreeView;
 using Telerik.Windows.DragDrop;
@@ -17,11 +19,34 @@ namespace EnableOnlyDropInsideItem_SL
         private void OnDragOver(object sender, Telerik.Windows.DragDrop.DragEventArgs e)
         {
             var options = DragDropPayloadManager.GetDataFromObject(e.Data, TreeViewDragDropOptions.Key) as TreeViewDragDropOptions;
-            if (options.DropPosition != Telerik.Windows.Controls.DropPosition.Inside)
+            var draggedItem = options.DraggedItems.ElementAt(0);
+            var dropItem = options.DropTargetItem.Item;
+            var dropItemChildrenType = GetChildCollectionType(dropItem);
+            var dragItemType = draggedItem.GetType();
+            var dropItemType = dropItem.GetType();
+
+            if ((dragItemType == dropItemType &&
+                dropItemChildrenType != dragItemType &&
+                options.DropPosition == Telerik.Windows.Controls.DropPosition.Inside) ||
+                (dragItemType != dropItemChildrenType && dragItemType != dropItemType))
             {
-                options.DropPosition = Telerik.Windows.Controls.DropPosition.Inside;
+                options.DropAction = DropAction.None;
                 options.UpdateDragVisual();
             }
         }
+
+        private static Type GetChildCollectionType(object dataItem)
+        {
+            if (dataItem is League)
+            {
+                return typeof(Division);
+            }
+            else if (dataItem is Division)
+            {
+                return typeof(Team);
+            }
+
+            return null;
+        }
     }
 }

TreeView/EnableOnlyDropInsideItem/MainWindow.xaml.cs

@@ -1,17 +1,8 @@
-using System;
+using EnableOnlyDropInsideItem.ViewModels;
-using System.Collections.Generic;
+using System;
+using System.Collections;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
 using Telerik.Windows.Controls.TreeView;
 using Telerik.Windows.DragDrop;
 
@@ -31,11 +22,34 @@ namespace EnableOnlyDropInsideItem
         private void OnDragOver(object sender, Telerik.Windows.DragDrop.DragEventArgs e)
         {
             var options = DragDropPayloadManager.GetDataFromObject(e.Data, TreeViewDragDropOptions.Key) as TreeViewDragDropOptions;
-            if (options.DropPosition != Telerik.Windows.Controls.DropPosition.Inside)
+            var draggedItem = options.DraggedItems.ElementAt(0);
+            var dropItem = options.DropTargetItem.Item;
+            var dropItemChildrenType = GetChildCollectionType(dropItem);
+            var dragItemType = draggedItem.GetType();
+            var dropItemType = dropItem.GetType();
+
+            if ((dragItemType == dropItemType &&
+                dropItemChildrenType != dragItemType &&
+                options.DropPosition == Telerik.Windows.Controls.DropPosition.Inside) ||
+                (dragItemType != dropItemChildrenType && dragItemType != dropItemType))
             {
-                options.DropPosition = Telerik.Windows.Controls.DropPosition.Inside;
+                options.DropAction = DropAction.None;
                 options.UpdateDragVisual();
             }
         }
+
+        private static Type GetChildCollectionType(object dataItem)
+        {
+            if (dataItem is League)
+            {
+                return typeof(Division);
+            }
+            else if (dataItem is Division)
+            {
+                return typeof(Team);
+            }
+
+            return null;
+        }
     }
 }