controls that have transparent areas

Hi everybody,
I'm trying to create controls that act like Microsoft Word's auto shapes so the control must have a transparent area, for example, a cricle, the remaining area outside the circle must be transparent
I tried some API fuctions "CreateRectRgn", "CreateEllipticRgn", and "SetWindowRgn" but they work with forms only and I can't use them with user controls
PLEASE help me it's very important to me
thank you for your patience
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You may have any action occur that you wish inside any area of the screen by handling OnClick() and checking the mouse pointer position against a set of points you have defined to be your area.  the Point object has a lot of facilitators to ease this process, but basically you have to do a lot of low level, nuts and bolts type programming unless you can find some code on the net.  

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