Change title font for QT Main window

[frdotnet]

Hello,

I was wondering how we can change the title font of the QT Main window. Please see the attached screenshot..
I tried changing style sheet etc, but it dint work. Also I tried to use c++ send message, but this dint work either :( -
SendMessage(form->effectiveWinId(), WM_SETFONT, ( WPARAM ) dF, (LPARAM) TRUE);

Response appreciated.

Thanks