how to chage font color depending on back ground skin color

Hi ,
[B]I would like to know how to change the FONT color depending on the Back ground Skin color.[/B]
I have seen in some applications that if we change the theme, its font color changes automatically .I would like to know how to achieve this.
I am new to this UI .
So any pointer to documents is also helpful.

Thanks you

You can experiment with AknsUtils::GetCachedColor.

MAknsSkinInstance* skin = AknsUtils::SkinInstance();
AknsUtils::GetCachedColor(skin, color, KAknsIIDQsnTextColors, EAknsCIQsnTextColorsCG6);

Hi,
How to change back ground color and text color

[URL="http://www.developer.nokia.com/Community/Wiki/Changing_QWidget_background_colour"]Background [/URL]can be the same as in the built in [URL="http://www.developer.nokia.com/Community/Wiki/TSS000683_-_Using_the_same_background_as_built-in_applications"]applications[/URL].