In the Xaml I have
In the code behind, when the close button I prompt the user to save changes (or not), but I want to allow the possibility for the user to cancel the operation
private void ClosingTabItemEx(object source, RoutedEventArgs args)
there seems to be no way to implement this, setting args.Handled=True doesnt work
Ok, it's not totally obvious, but here is how to do it...
{
cancellable.Cancel = true;
The Closing event uses a delegate of type EventHandler<TabClosingEventArgs>. When I had VS generate the handler (i.e. in xaml I chose Closing from the intellisense and had it create the handler) it correctly created a method that took TabClosingEventArgs as the e parameter and not RoutedEventArgs. Did you manually create the method or did you use some other method for creating the method?