OS.InvalidateRect (handle, null, true);
if (OS.IsWinCE) { OS.InvalidateRect (handle, null, true); } else { int flags = OS.RDW_ERASE | OS.RDW_FRAME | OS.RDW_INVALIDATE; OS.RedrawWindow (handle, null, 0, flags); }
void setBackgroundPixel (int pixel) {	if (background == pixel) return;	background = pixel;	OS.InvalidateRect (handle, null, true);}