Stefan,

Thanks for the reply but other controls can receive focus (buttons, dropdown) via the mouse just not via the keyboard.  The probem is with the TextBox this means it effectively disables the TextBox just because you don't want to be tabbed onto it.

The reason I don't want to be tabbed onto it is that Keyboard Events for the TabStops suppresses keyboard events for controls that are not TabStop's (e.g. the Image control)

I think you are going to have some complaints from the Casual Gaming community who may wish to use a non TabStop control and a TextBox and find that when the Textbox is used it interferes with their game.  This is the exact situation I have with the Spectrum Emulator.  I think the suggestion from ccoombs will work but this is a hack.