PARTREDRAW GuiName L T W H 

  This command was added to make redrawing of windows easier to the eye.
  It will redraw only part of the window, thereby reducing the flashing.

  Use this if you're just changing some gadgets in one area of the
  window and do not want a full redraw.

  L T W H denote the area which you want redrawn.

  It's exactly the same as the  Redraw  command, only that
  a part of the window is erased instead of all the window as is done
  in the Redraw command. Otherwise, the gadgets, graphics etc are drawn
  from scratch, same as with Redraw.