How to make a WPF TextBox pass-through ApplicationCommands?

Question

The WPF TextBox captures Ctrl-Z and Ctrl-Y for its own undo/redo. Normally great, but in our app we have some text boxes that I don't want to have this behavior, but to instead pass through to the overall app to handle as global undo.

I figured out I can override the text boxes' handling of these by adding CommandBindings for ApplicationCommands.Undo/Redo.

My question: how can I 'forward' those bindings to the parent framework element so that it eventually routes to the app's handler I installed on the main window?

Update: Thanks to AndrewS it turns out all I needed was to set IsUndoEnabled to false. Then the app commands get ignored and the top level window can handle them. Yay!

Answer 1

You have to register a KeyBinding for the shortcut and associated it with the ApplicationCommands.NotACommand. e.g.

    <TextBox>
        <TextBox.InputBindings>
            <KeyBinding Key="Y" Modifiers="Control" Command="NotACommand" />
            <KeyBinding Key="Z" Modifiers="Control" Command="NotACommand" />
        </TextBox.InputBindings>
    </TextBox>