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merge variable as a button label

Question asked by on Mar 7, 2017
Latest reply on Mar 8, 2017 by

want label to show OFF, press once for ON, then again for OFF ... repeating ...

using merge variable as label ... <<$$bl>>

thanks to help from forum & case statement, it easily switches from ON to OFF and back ... Case (  IsEmpty ($$bl) or $$bl = "OFF"  ; "ON" ; "OFF" )

but despite using onLayoutEnter to set to "OFF"... it does not do this always ...

apparently sets to a label that is BLANK, perhaps NULL ... how do I get it to show OFF as I enter the layout, and then ON with one press?