TextInput event on DataGrid

WPF Version 4.0

This had me scratching my head for quite a while. Eventually it was Microsoft's documentation that revealed the way (could be a first!).

The problem is that the TextInput event bubbles, which means the TextBox got a crack at it before the DataGrid. The TextBox marked the event as handled, so it was not getting raised for the DataGrid. However, I vaguely remembered that there is a way to attach an event handler so that it gets raised EVEN FOR HANDLED EVENTS. I found some examples on Google but they are all for C#. The syntax for doing this in VB is as follows...

myDataGrid.AddHandler(TextBox.TextInputEvent, DirectCast(AddressOf myTextInputHandler, RoutedEventHandler), True)

For C#
myDataGrid.AddHandler(TextBox.TextInputEvent, new RoutedEventHandler(myTextInputHandler), true);

This is a very powerful technique because it can also attach handlers for events the target does not directly support. For example, you could attack a click event to a Label which would cause the Label to call your event handler when anything inside that label raised a click event. You can do this even though the Label control does not support the click event. In this case the following would not work.

AddHandler MyLabel.Click, Addressof MyLabelClickHandler