RadCombobox: prevent “Backspace” button from clearing selected item.

[Andrii]

It seems that default behavior of RadCombobox is to clear selected item when control is focused, some item is selected  and “Backspace” button is pressed. 

I need to cancel this behavior in order to prevent setting of null as the selected combobox value. I tried to override KeyDown and KeyUp methods of RadCombobox and handle the click on “Backspace” but it did not fix the problem.

Are there any other ways to change this keyboard behavior?

Regards,

Andrii

[Princy]

Hello Andrii,

Try the following code to prevent "Backspace" button from clearing the text.
C#:

public MainPage()
{
   InitializeComponent();
   RadComboBox1.AddHandler(KeyDownEvent, new KeyEventHandler(RadComboBox1_KeyDown), true);
}
   string combotxt;
   private void RadComboBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if(e.Key==Key.Back)
          {
             if (RadComboBox1.SelectedItem == null)
               {
                   RadComboBox1.EmptyText = combotxt;
               }
         }
    }

        private void RadComboBox1_SelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
        {
            combotxt = RadComboBox1.Text;
        }

Thanks,
Princy.