Wpf combo box header

I have a combo box in which, for example, I have the options of:

- Robot 1

- Robot 2

- Robot 3

As default if I pick 'Robot 1' it will send a nice 'wake up' message to the robot and automatically show 'Robot 1' in the header whether it is connected to the robot or not. Is there a way that I can make the header not show the robot number until it is actually connected to the robot?

Thanks :)