title: Form with Transparent Background
body: <p>I want to set the Background color of my form to transparent. I know that this is possible by setting <code>TransparencyKey</code>, but this wont work for me because I have an image with different alpha values rendered on the form. I tried to overwrite the <code>OnPaintBackground</code> method but then I get a black background. Is there a better way to set the forms background transparency?</p>