I'm so glad to finally have some knowledge to contribute back to the forum!

The answer to this problem is that the key press, in this case a tab key (or back tab) is being passed on to the control which receives focus, resulting in the tab being executed on the . So, my solution is simply to change the KeyCode to some other value (not exactly sure what it should be yet - I used 0, but I'm not sure if that's the right code to use).