>I remember reading a suggestion to put a small button where required, and cover that with your custom shape, then you can use the visible shape to control the hidden button!
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>Made sense, becasue you could load various shapes as required without re-writing the button for every shape!

The limitation with this is that you don't get the visual functionality (unless you add a lot to the shape) that you do with a button. There is also no focus (LostFocus/GotFocus or visual focus indication) for a shape so you don't know what control you are on.