I have found no information / documentation that suggests default buttons apply only to dialog boxes. Even so, if you use Win32::GUI::DialogBox instead of Win32::GUI::Window, the resulting behavior is the same. Also, according to the docs for Window:
-dialogui => 0/1 Act as a dialog box.
I have been searching for an answer in the Win32.pm and GUI.pm code but can't find anything that leads me to the answer. I get the feeling that I need to manipulate the window somehow after changing the button but I'm just guessing.

In reply to Re^2: How to change the default (ok) button in Win32::GUI by ChrisR
in thread How to change the default (ok) button in Win32::GUI by ChrisR

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