Thanks for the response, but think we are at cross purposes.
The problem we have is that we have windows with buttons that popup acknowledgement windows when the button is clicked, with for example an "ok" button them. The problem we have is that UICamera caches the last button that was clicked and if you hit "Enter" it reruns the button click which opens the acknowledgement window a 2nd time. We could trap this in the button handler and ensure the window is only opened once, but would prefer to set the focus of the "Enter" key press to be the "ok" button on the acknowledgement window.