How to prevent a form from being activated/gaining focus.

I'm working on a project where I want to be able to click on a form but not have the form keep focus. Although not what I'm working on at the moment but the Windows On Screen Keyboard is a good example. The OSK when clicked on doesn't take focus, but keeps the focus on the control that had the focus before. It does this but still is able to proccess an onclick event and send the keystroke over to the control that has focus.
I'm needing to do something similar. I've tried overriding the onActivate method but it seems by then the form has already taken focus.
Any help is appreciated.