Sets the background color for a widget in a particular state.
All other style values are left untouched. See also Widget.modifyStyle.
> Note that “no window” widgets (which have the GTK_NO_WINDOW > flag set) draw on their parent container’s window and thus may > not draw any background themselves. This is the case for e.g. > gtk.Label > > To modify the background of such widgets, you have to set the > background color on their parent; if you want to set the background > of a rectangular area around a label, try placing the label in > a gtk.EventBox widget and setting the background color on that.