How to stop an event propagation to a parent control.

[Young-Lae Chung]

Hi.

I used two RadExpanders  in application.
The one is nested in another one (parent / child relationship).

I want to use a expand (or collapsed) event handler seperately.
But when child expander's event is fired, the event is propagated to parent's event handler.

How can I stop it ?

Please, let me know that. 

Thanks. 

[Young-Lae Chung]

I solved above problem using Handled property of RadRoutedEventArgs.

In collapsed-event handler of child expander. 

private void SelectionExpander_Collapsed(object sender, RoutedEventArgs e)
{
   ((Telerik.Windows.RadRoutedEventArgs)(e)).Handled = true;
}

After do that, collapsed-event is not propagated to event handler of parent expander.

If you have other solutions, please let me know that.

Thanks.  

[Petar Mladenov]

Hi Young-Lae Chung,

Another workaround could be the following: in the PreviewCollapsed event of the parent Expander, you check whether the child Expander is collapsed. And if it is ==> set  e.handled = true again. In addition the two approaches seems to be similar, but they can behave in a different way if you have more child expanders or more parent expanders or both. Feel free to ask if you need further assistance.

Best wishes,
Petar Mladenov
the Telerik team