Please show full snippets that work, or demonstrate your problem. All the dialogs I have tested, have their X button disabled automatically. You might try 
$dialog->protocol('WM_DELETE_WINDOW' => sub { 
           print "nope\n"; 
            });

[download]
that 
my $dialog = $Global::mw->Dialog()

[download]
looks odd, and may be interfering with the window manager controls.
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re: Handling Dialogbox by zentara
in thread Handling Dialogbox by kranthi

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