This is a GDIPlus rendering issue and can be supported in Win2K, but may require a hotfix or service pack. 

Just FYI, this is not an SF issue, but a .NET rendering issue and this is something we do not have control over.

Any leads on how to figure where the hotfix or service pack for this is?

I really do not know where to tell you to start.  I now that one file involved is the GDIPlus.dll, but there are a number of others as well.  It has been a long time since we supported Windows 2000.  Here is one thing you might look for on Google: ".NET, Windows 2000, TransparencyKey" and go from there.  This is just an issue between .NET and the Windows 2000 environment on this particular point.  Native form transparency wasn't a native fixture until Windows XP, so there is a patch or update that is required for Windows 2000 to work....and I am sorry I can't point you directly to it

Well, if there is an update, I'm having a hell of a time finding it. Everything I read says that transparency is supported starting with Win2K.



I created a simple app and the transparencykey work fine. I simply put a label on the form, set the backcolor of the label to some bright color, set the backcolor of the form to 'control' and the transparencykey to 'control' (the system color). The form was transparent. So, the problem must be more than just the transparency key.



Also, are you saying that you don't support Windows 2K? I missed that during the evaluation. If you don't, I suppose I'm on my own and will have to re-implement the MessageForm class to not use whatever is broken. If that is the case, could you point me in the right direction there so I don't have to hunt for the bits that need to be removed/replaced?