add 2 kb articles for september

knowledge-base/calendar-picker.md

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+---
+title: Calendar picker
+description: how to create a calendar picker control
+type: how-to
+page_title: calendar picker that displays the calendar control
+slug: calendar-picker
+position: 
+tags: 
+ticketid: 1529808
+res_type: kb
+---
+
+## Environment
+<table>
+	<tbody>
+		<tr>
+			<td>Product Version</td>
+			<td></td>
+		</tr>
+		<tr>
+			<td>Product</td>
+			<td>Progress® Telerik® UI for Xamarin</td>
+		</tr>
+	</tbody>
+</table>
+
+
+## Description
+
+This article shows how to create a Calendar picker control which allows you to pick a date froma calendar. 
+
+## Solution
+
+In order to create a calendar picker control you have to use the Telerik UI for Xamarin [Templated Picker]({%slug templated-picker-overview%}) control. 
+
+## Example
+
+Add the templatedPicker to the page and inside the RadTemplatedPicker.SelectorTemplate add the RadCalendar control:
+
+```XAML
+<telerikInput:RadTemplatedPicker>
+    <telerikInput:RadTemplatedPicker.SelectorTemplate>
+        <ControlTemplate>
+            <telerikInput:RadCalendar SelectedDate="{TemplateBinding SelectedValue, Mode=TwoWay}"/>
+        </ControlTemplate>
+    </telerikInput:RadTemplatedPicker.SelectorTemplate>
+</telerikInput:RadTemplatedPicker>
+```
+
+Add the namespaces:
+
+```XAML
+xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input"
+```

knowledge-base/combobox-border-not-visible-uwp-release.md

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+---
+title: ComboBox border is not visible in release build (UWP)
+description: border is not visible in release uwp build and button looks different
+type: how-to
+page_title: ComboBox border is not visible in release build (UWP) and drop-down button looks different
+slug: combobox-border-not-visible-uwp-release
+position: 
+tags: 
+ticketid: 1536269
+res_type: kb
+---
+
+## Environment
+<table>
+	<tbody>
+		<tr>
+			<td>Product Version</td>
+			<td>2021.3.915.1</td>
+		</tr>
+		<tr>
+			<td>Product</td>
+			<td>ComboBox for Xamarin</td>
+		</tr>
+	</tbody>
+</table>
+
+
+## Description
+
+The article will show you how to visualize the Border that wrapps around the ComboBox control. When the app is built for UWP in Release Mode the border is not visible. The reason behind this is that the .NET Native Toolchain strips the assemblies needed for visualizing the RadBorder control.
+
+In addition the drop-down button and clear button look different.
+
+## Solution
+
+Make sure that the Telerik renderers are not stripped out by the UWP .NETNative compilation step. Add the following code inside the App.xaml.cs file of the UWP Project:
+
+```C#
+var assembliesToInclude = new List<Assembly>()
+{
+    typeof(Telerik.XamarinForms.Input.RadButton).GetTypeInfo().Assembly,
+    typeof(Telerik.XamarinForms.InputRenderer.UWP.ButtonRenderer).GetTypeInfo().Assembly,
+    typeof(Telerik.XamarinForms.Primitives.RadBorder).GetTypeInfo().Assembly,
+    typeof(Telerik.XamarinForms.PrimitivesRenderer.UWP.BorderRenderer).GetTypeInfo().Assembly,
+};
+Xamarin.Forms.Forms.Init(e, assembliesToInclude);
+```