def close_rect(self):
border = self.border_width()
rc = Rect(border, border, self.width(), self.caption_height())
margin = self.system_control_margin()
side = rc.height() - 2 * margin
rc.set_top(rc.top() + margin)
rc.set_bottom(rc.bottom() - margin)
rc.set_left(rc.right() - side)
rc.translate(-margin, 0)
return rc
