Comment out the line: 
# $notification->overrideredirect(1);    # Remove window decorations
# and probably add
#prevents window from closing on close icon press
 $notification->protocol('WM_DELETE_WINDOW' => sub {   });

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In reply to Re^3: Tk - non-blocking messageBox without buttons closing without user input by zentara
in thread Tk - non-blocking messageBox without buttons closing without user input by dzon

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