Try to right click on your button, go down to where it says Animation. Under this dialog there should be several options such as Visibility, Color, and Touch. Select the Touch option and it should bring up a dialog box where you can write an expression.
I do not have the software in front of me, but I think this might do what you want.
Edit: It seems the Touch option may not be available in ME.
http://www.plctalk.net/qanda/showthread.php?t=117996
I do not have the software in front of me, but I think this might do what you want.
Edit: It seems the Touch option may not be available in ME.
http://www.plctalk.net/qanda/showthread.php?t=117996
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