USAGE
void RefreshGadget(Window, ID)
FUNCTION
This refreshes the gadget whose GadgetID is given. Unlike the Intuition call
RefreshGadgets, only this gadget is refreshed, so it is much faster.
INPUTS
WINDOW = Pointer to the window this gadget is in.
ID = GadgetID of the gadget to refresh.
RESULT
none (void)