Hide/Disable a button

i have the following button within my code and woudl like to disable it after its been clicked and also enable another

           on ClickStart_(sender)

              ..... disable ClickStart_ 

             ..... enable ClickStop_ 
           end ClickStart_

not sure how to ref as its connection is via the GUI.

well after a little trial and error i realsised that i can also link it to a variable to, then use this to enable/disable.

      property startButton : missing value

         on ClickStart_(sender)
               --disable btn
                tell startButton to setEnabled_(false)