$mw->deiconify();
[download]

will raise your mainwindow, if it's iconified before.
What you're looking for is maybe this:

 
$mw->protocol('WM_DELETE_WINDOW', \&ExitApplication);

MainLoop;

sub ExitApplication {
    # do nothing    
}
[download]

I'm not sure if there are other protocol-types for raise and the stuff in the right top corner ...

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