How to use WPF RichTextBox (SfRichTextBoxAdv) control in Windows Forms application?

 The sample code was helpful.  Is there some way to implement a paste event handler on the wpf control  in the sample app - to check the paste contents prior to the operation being performed?

In the Form1_Load method, I've tried:

System.Windows.DataObject.AddPastingHandler(RichTextBoxAdv, PasteHandler);

and

RichTextBoxAdv.AddHandler(System.Windows.DataObject.PastingEvent, new System.Windows.RoutedEventHandler(PasteEventHandler), true);

The corresponding methods were as below, but no break point is ever hit in the handlers. 

        private void PasteEventHandler(object sender, System.Windows.RoutedEventArgs e)
        {
            var x = sender as SfRichTextBoxAdv;

        }

        private void PasteHandler(object sender, System.Windows.DataObjectPastingEventArgs e)
        {
            var x = sender as SfRichTextBoxAdv;
        }

Is there something special I need to do when the wpf control is hosted in winforms?  Or are only exposed events on the wpf control supported?

Thanks!