Umm.. according to 'man Tk::Widget', 
   $widget->toplevel
           Returns the reference of the top-level window containing $w
+idget.

[download]
Which sounds to me like your $b->toplevel->bind .. is binding to the MainWindow that the BrowseEntry is in, eg. your $main widget. I'm assuming $b is your BrowseEntry Widget, which you don't say.
Why not just do  $combo->bind( .. ) to add a ButtonRelease to your BrowseEntry widget?

Apologies if I've understood this wrong, please post the rest of the code so we can see what its doing.

C.

In reply to Re: Tk::BrowseEntry eats click binding by castaway
in thread Tk::BrowseEntry eats click binding by tall_man

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