Transparent Frame

Is it possible to make a frame transparent? I tried using a widget with setWindowOpacity() but because of

Note that under X11 you need to have a composite manager running, and the X11 specific _NET_WM_WINDOW_OPACITY atom needs to be supported by the window manager you are using.

it did not work... i designed my window in designer and am trying to make a small frame be transparent so that the background image is visible through my settings frame.

any suggestions would be greatly appreciated and helpful

thanks for your time