name required description type Yes "picture" control_name Yes foreground_colour background_colour border_type border_width left_follows top_follows right_follows bottom_follows x Yes y Yes width Yes height Yes draw_func_name left_MB_pressed_fname left_MB_released_fname right_MB_pressed_fname right_MB_released_fname middle_MB_pressed_fname middle_MB_released_fname moved_while_MB_down_fname context