From most preferred to least preferred they are:

1. Double-click on the control to add a Link To paragraph (or add it by clicking on Link To in the properties view), and enter a number for the exception-value property
2. Add a cmd-clicked exception paragraph (automatically adds an Exception procedure)
3. Add a cmd-clicked event paragraph (automatically adds an Event procedure)

       is-screen-3-proc.
           perform until exit-pushed
              accept screen-3
              on exception perform is-screen-3-evaluate-func
              end-accept
           end-perform.
           destroy window-handle.
           initialize key-status.
       is-screen-3-evaluate-func.
           evaluate true
           when exit-pushed
              perform is-screen-3-exit
           when event-occurred
              if event-type = cmd-close
                 perform is-screen-3-exit
              end-if
              when key-status = 1000
                 perform screen-3-pb-2-link-to
           end-evaluate.
           move 1 to accept-control.
       is-screen-3-exit.
           set exit-pushed to true.

        screen-3-pb-1-link-to.
             modify screen-3-lb-1 item-to-add "Hello".
            .

With manually assigned exception values it is possible to have a menu entry and/or function key generate the same exception value so that the user could perform the function in more than one way. In fact, "Link To" is the preferred way to specify a paragraph to execute when the user selects a menu entry.

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