xaml-sdk/AutoCompleteBox/SingleSelectionModeWithClearButton/Example.xaml

<UserControl x:Class="SingleSelectionModeWithClearButton.Example"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <StackPanel Width="350">
        <TextBlock Margin="10 10 10 0" TextWrapping="Wrap" 
            Text="This example demonstates how to add a button that clears the current SelectedItem in Single SelectionMode."/>
        <TextBlock Margin="10" TextWrapping="Wrap"
            Text="For example type 'Bulgaria' and select it - a cross button will appear."/>
        <telerik:RadAutoCompleteBox ItemsSource="{Binding Countries}" 
                                    Width="250" 
                                    DisplayMemberPath="Name" 
                                    TextBoxStyle="{StaticResource CustomTextBoxStyle}"
                                    SelectionMode="Single" 
                                    SelectedItem="{Binding SelectedItem, Mode=TwoWay}" />
    </StackPanel>
</UserControl>