Ok for MDI
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1410, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 495, in callit
    func(*args)
  File "/home/j/dev/kernel/src/emc2/emc2-dev/bin/axis", line 841, in update
    user_live_update()
  File "/home/j/dev/kernel/src/emc2/emc2-dev/bin/axis", line 2589, in user_live_update
    c.commands.clear_offset("2")
AttributeError: 'linuxcnc.command' object has no attribute 'commands'