Background coloring of a control

[Alfred Van Hoek <vanhoek at mac dot com>]

I am having problems getting a background color to show. I am most likely
overlooking something, and searched at many places. Can someone help out
here?:

For example:

    RGBColor rgb;
    WindowRef wref = REALGetWindowHandle(data->windowContainer);
    GetPortBackColor(GetWindowPort(wref), &rgb);

rgb will be {0xFFFF, 0xFFFF, 0xFFFF}

    colr.red = 125;
    colr.blue = 23;
    colr.green = 50;
    RGBBackColor(&colr);

and to check:

    GetPortBackColor(GetWindowPort(wref), &rgb);

rgb will have the colr values, suggesting that the port is already set to
the wref. I guess that everything is done correctly, but why does not it
show? 

And on another note, what's the reason that the graphics class or the canvas
control doesn't have a back-color property, like the window class?

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