Change Window Background Color



Hi,

My question is how to change window background color on the fly, if I
have the window HWND.

I need a method like

void ChangeColorToBlack(HWND hwnd)
{
// code to change the window background color to black.
.......

}

What I would like to do is to enumerate all child windows of a given
window by calling EnumChildWindows, then change the window background
color of each child window

Thank you

.