first change

    def zoomin(event=None):
                commands.task_stop()
#                c.set_block_delete(0)
        	ensure_mode(linuxcnc.MODE_MDI)


		commands.send_mdi_command("G1 F40 X5 Y0")

		commands.send_mdi_command("G1 F40 X0 Y5")
		 
		commands.send_mdi_command("G1 F40 X0 Y0")