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I think 130 is Script Terminated by CTL-c - which I think a user would only see if the script is run from a terminal and CTL-c issued when the terminal - not the dialog box - has focus. That stanza may be superfluous.
I think 252 is so the close button will function if a user leaves the dialog window decorated. Can't verify that one though.
Edit - sort of verified it. Comment out that sections and the close button no longer functions.