ActiveX Control

Hello World! ;-)
Ok, I have following problem:
I'm writing an ActiveX control that is similar to an Label,
only difference: you can change the Angle in which the Text is displayed. For doing that I use an API function to draw on the control. Well, everything works fine, except: I can't make the background transparent. When I make the Background of the Control transparent, I'm not able to draw on my control.
could please anyone help me?

thanks in advance!

Well, it seems that nobody is interested in that subject....
No matter, I have found a solution for that problem: I have used the CreaterectRgn and the SetWindowRgn API calls to make the background of the lable transparent.