Mouse Events for Geomtry shapes in Silverlight

Question

I have started Silverlight applications recently. I have created one silverlight application in which I have added two rectangle shapes through code and also implemented Mouse button events for these rectangles. But when I take Rectangle Geometry instead of Rectangle shape, I am not getting events  to associate to them.
Can anyone tell me how can I handle events for Geometry shapes?
Thanks & Regards
Padma