C# Alpha Blended form with Alpha Blended Controls

Alpha blended forms a开发者_如何学Gore no problem (for example http://www.codeproject.com/KB/graphics/alphaBG.aspx) but alpha blended controls like pictureboxes with 32bit images don't work...

Here is my problem:

I have the alpha blended form (which doesn't have to be alpha blended) and on a full transparent part of the form I want to draw the picturebox with an 32bit image. But this Image has at the background the transparent color(Fuchsia)

How can I make it, that the picturebox is also fully blended?

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Have a look at this thread on the MSDN forum http://social.msdn.microsoft.com/forums/en-US/netfxcompact/thread/9aeab184-2a45-4bd4-8157-2a629523e80b/ and this one on C# Corner http://www.c-sharpcorner.com/UploadFile/mahesh/DrawTransparentImageUsingAB10102005010514AM/DrawTransparentImageUsingAB.aspx