Checking the state of a check box

Hi all,

I am trying to 'read' the state of a check box. Seems to work fine when i check it. For testing, I let the check box call an action group where I change the content of a text field to the content of the variable assigned to the check box.

When checking, the text field content changes to on.

When unchecking, nothing happens. It runs the action group (checked via simple message box with dummy message), but the content of the text field does not change. It seems as the content of the variable does not change back to nothing or to off.

Any suggestions?