Thanks Bruce,
When I tick the box "Send Button Click to server" the NWB button almost becomes a flat checkbox?
When I click the button in the NWB it dimms, and stay dimmed even if I click another row.
When I uncheck "Send Button Click to server" the button goes back to a "normal" push button.
Am I doing something wrong?
PS: The code for session value works when "Send Button Click to server" selected :-)