RadHighlightTextBlock in an editable RadComboBox

Environment

Product Version	2023.3.1011
Product	RadHighlightTextBlock for WPF

Description

How to use RadHighlightTextBlock in an editable RadComboBox.

Solution

Define a new DataTemplate that contains a RadHighlightTextBlock instance and set it to the ItemTemplate property of RadComboBox. Bind the Text property of the RadHighlightTextBlock to the property from the items' model that will be displayed in the RadComboBox instance. Bind the HighlightText property to the Text property of RadComboBox.

Define the items' model and the view model

public class ItemInfo 
{ 
    public string Content { get; set; } 
} 
 
public class MainViewModel 
{ 
    public MainViewModel() 
    { 
        this.ItemInfos = new ObservableCollection<ItemInfo>() 
        { 
            new ItemInfo() { Content = "Item 1" }, 
            new ItemInfo() { Content = "Item 2" }, 
            new ItemInfo() { Content = "Item 3" }, 
        }; 
    } 
 
    public ObservableCollection<ItemInfo> ItemInfos { get; set; } 
} 

Public Class ItemInfo 
    Public Property Content As String 
End Class 
 
Public Class MainViewModel 
    Public Sub New() 
        Me.ItemInfos = New ObservableCollection(Of ItemInfo)() From { 
            New ItemInfo() With { 
                .Content = "Item 1" 
            }, 
            New ItemInfo() With { 
                .Content = "Item 2" 
            }, 
            New ItemInfo() With { 
                .Content = "Item 3" 
            } 
        } 
    End Sub 
 
    Public Property ItemInfos As ObservableCollection(Of ItemInfo) 
End Class 

Creating a DataTemplate with a RadHighlightTextBlock

<DataTemplate x:Key="HighlightTextBlockDataTemplate"> 
    <telerik:RadHighlightTextBlock Text="{Binding Content}"  
                                   HighlightText="{Binding Path=Text, RelativeSource={RelativeSource    AncestorType=telerik:RadComboBox}, Mode=TwoWay}"/> 
</DataTemplate> 

Set the custom DataTemplate to the ItemTemplate property of RadComboBox

<telerik:RadComboBox IsEditable="True" 
                     ItemsSource="{Binding ItemInfos}" 
                     telerik:TextSearch.TextPath="Content" 
                     ItemTemplate="{StaticResource HighlightTextBlockDataTemplate}"/> 

RadComboBox with RadHighlightTextBlock

Integration with the RadHighlightTextBlock control and enabled autocomplete functionality is not supported. If you need highlighting in an autocomplete scenario, you can check the RadHighlightTextBlock with RadAutoCompleteBox and RadHighlightTextBlock with RadAutoSuggestBox articles.