Thank you, Jesse, for your quick response!
To be clear, I don't need to write anything under the "Specify" button of the custom dialogue?
Thank you again.
You are right,
the specify button is what text will display on the button itself, if you wanted the text to change, you could use a calculation here to specify that change.
Hope this clarifies things for you.
Worked like a charm!
The specify calculation is only for giving the button a name. You do not need to do anything else. The Get( lastmessage Choice) lets you know what button the user selected in the dialog box ( either a 1,2 or 3). You use this information in an If statement to determine what the script does after the dialog box.