Re^4: Can't get Dialog or messageBox to work from button

Why do you think that Perl couldn't find displayMsg? The debug output certainly shows that it was found and called. If Perl couldn't find a subroutine, it would have raised an error which the OP would have seen.

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Re^5: Can't get Dialog or messageBox to work from button by hotchiwawa (Scribe) on Jan 11, 2016 at 16:50 UTC
Probably that in Tk methods, Tk prefer to have the address of the functions (object reference).	[reply]
Re^6: Can't get Dialog or messageBox to work from button by Corion (Patriarch) on Jan 11, 2016 at 16:58 UTC
But that's what `sub { ... }` already returns. There is no need to have a subroutine reference that itself returns another subroutine reference when called, especially when you want the function call to happen instead.	[reply] [d/l]