Read-only ComboBox : Backspace KeyDown event not triggered

[develuser]

Hello Telerik,

I've created a behavior which essures that the ComboBox stay open when a key is down.

public class ComboListStaysOpenOnEditBehavior : Behavior<RadComboBox> {

    protected override void OnAttached() {
        this.AssociatedObject.KeyDown += new KeyEventHandler( OnKeyDown );
    }

    void OnKeyDown( object sender, KeyEventArgs e ) {
        AssociatedObject.IsDropDownOpen = true;
    }
}

It works fine, but if the RadComboBox is read-only, the KeyDown event don't trig when the backspace is pressed.
I use RadControl for Silverlight v 2012.1.430.1050 with Visual Studio 2010 and Silverlight 5.

Could you please take a look at this problem ?

Greetings,
Laurent

[Ivo]

Hello Laurent,

The backspace key is handled by the RadComboBox control and that's why the KeyDown event is not fired. I think that the only way to get this working would be to inherit from the RadComboBox and override the OnKeyDown method.

public class RadComboBoxExtended : RadComboBox
{
    protected override void OnKeyDown(KeyEventArgs e)
    {
        this.IsDropDownOpen = true;
        base.OnKeyDown(e);
    }
}

All the best,
Ivo
the Telerik team

[develuser]

Hello Ivo,

Thank you very much,

Laurent