Yes Graham I have seen it. The 45 second long one demonstrates the "two state button"
However it wont work for me.

Must be doing something wrong.
This is what I'm doing. For example a RUN button.
Set a LED and assign a two sided BMP to it and set function "run"
Then place an IMAGE BUTTON over it and set it to function "run"
Try that in Mach and the button does not change state.
Go back to Screen4 and move the IMAGE BUTTON off the LED.
Try again in Mach and it now changes state.
Back to Screen4 and move the IMAGE BUTTON to only half cover the LED.
In Mach now the half that is not covered changes state and the covered half does not. Weird Hey!!!
So any ideas? Am I doing something very stupid?

Greg