xaml-sdk/ChartView/WPF/DragToSelect/MainWindow.xaml

<Window x:Class="DragToSelect.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:local="clr-namespace:DragToSelect"
        Title="MainWindow" Height="350" Width="525">
    <FrameworkElement.Resources>
        <Style x:Key="SelectionRectangleStyle1" TargetType="Rectangle">
            <Setter Property="Fill" Value="#22AABBCC" />
            <Setter Property="Stroke" Value="#DDAABBCC" />
            <Setter Property="IsHitTestVisible" Value="False" />
        </Style>
        <Style x:Key="SelectionRectangleStyle2" TargetType="Border">
            <Setter Property="Background" Value="#22AABBCC" />
            <Setter Property="BorderBrush" Value="#DDAABBCC" />
            <Setter Property="BorderThickness" Value="1" />
            <Setter Property="CornerRadius" Value="2" />
            <Setter Property="IsHitTestVisible" Value="False" />
        </Style>
    </FrameworkElement.Resources>
    <Grid>
        <telerik:RadCartesianChart x:Name="chart1" Palette="Flower" 
                                   SelectionPalette="FlowerSelected" 
                                   local:ChartUtilities.IsDragToSelectEnabled="True"
                                   local:ChartUtilities.SelectionRectangleStyle="{StaticResource SelectionRectangleStyle1}">
            <telerik:RadCartesianChart.HorizontalAxis>
                <telerik:DateTimeContinuousAxis />
            </telerik:RadCartesianChart.HorizontalAxis>
            <telerik:RadCartesianChart.VerticalAxis>
                <telerik:LinearAxis />
            </telerik:RadCartesianChart.VerticalAxis>
            <telerik:RadCartesianChart.Series>
                <telerik:PointSeries CategoryBinding="XCat" ValueBinding="YVal" ItemsSource="{Binding}" />
            </telerik:RadCartesianChart.Series>
            <telerik:RadCartesianChart.Behaviors>
                <telerik:ChartPanAndZoomBehavior x:Name="panZoomBehavior" />
            </telerik:RadCartesianChart.Behaviors>
        </telerik:RadCartesianChart>
        <Border Background="White" BorderBrush="LightGray" BorderThickness="1" HorizontalAlignment="Right" VerticalAlignment="Top">
            <StackPanel>
                <RadioButton Content="drag-to-zoom" Checked="RadioButtonDragToZoom_Checked" />
                <RadioButton Content="drag-to-select" Checked="RadioButtonDragToSelect_Checked" IsChecked="True" />
            </StackPanel>
        </Border>
    </Grid>
</Window>