GFILL 0,0,399,239,#BLUE
You can also use a ton of preset colors by using #RED #GREEN ECT.
You could also use RGB for the color to set it to any 8bit color value.
right below run. Put CLS in and then hit that ? below run. It will bring up a help menu for the CLS command. You can hit that puestion mark on any of the green command words.