New to Telerik UI for WPF? Download free 30-day trial


RadAutoSuggestBox executes its search and clear query actions using a couple of commands.

To replace the default actions of the commands, you can implement the ICommand interface (or use the Telerik's DelegateCommand implementation) and set the ClearButtonCommand and QueryButtonCommand properties of RadAutoSuggestBox.

The following example shows how to setup two DelegateCommand objects which implement ICommand and assign the custom commands to the corresponding properties in order to replace the default search and clear behaviors.

Example 1: Setting up the view

<telerik:RadAutoSuggestBox x:Name="radAutoSuggestBox" /> 

See how to setup a runnable RadAutoSuggestBox example in the Getting Started article.

Example 2: Implementing and assigning the commands

public MainWindow() 
    this.radAutoSuggestBox.QueryButtonCommand = new DelegateCommand(OnQueryExecuted); 
    this.radAutoSuggestBox.ClearButtonCommand = new DelegateCommand(OnClearExecuted); 
private void OnClearExecuted(object obj) 
    this.radAutoSuggestBox.Text = string.Empty; 
    this.radAutoSuggestBox.IsDropDownOpen = false; 
private void OnQueryExecuted(object obj) 
    // Where List<CountrInfo> is the user defined collection with bussiness objects 
    var source = (List<CountryInfo>)this.radAutoSuggestBox.ItemsSource; 
    var queryResult = source.FirstOrDefault(x => x.Name.ToLowerInvariant().Contains(this.radAutoSuggestBox.Text)); 
    if (queryResult != null) 
        this.radAutoSuggestBox.Text = queryResult.Name; 
    this.radAutoSuggestBox.IsDropDownOpen = false; 

See Also

In this article
Not finding the help you need? Improve this article