No color under WindowsNT/4.0 with GritAppFrame

I wrote a code in Visual C++ to read out an objfile and show it under WindowsNT/4.0.
Therefore I created an AppFrame under Grit.
Whatever I tried to give the color with glcolor3i(red,green,blue) or glcolor3f(…) it appeared in wrong or black color.
I don’t know if the mistake is under Grit or Windows ?