How to create a color form in BP?

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Ayy ideas on how to create a form with a background color that differs from the standard 'system' color? I know the 'SetSysColors' does this in the Win32 API, but if it is possible to use this for BP, what values would one pass to the function, and how?

Here is the .decls for this function:

api_SetSysColors% (nChanges%, lpSysColor%, lpColorValues%)

I believe the 'lpSysColor' value would be:
COLOR_APPWORKSPACE as listed by the API-Guide, but I havent a clue on the other values, or how one would use them in this case.

TIA,

WM