GTK1.X, GtkCombo updating on OSX?

What is the method that's called when you click the down arrow button on a gtkcombo widget? I'd like to directly control this if possible. Reason: The GTKCombo widget isn't fully updating for me on OSX (works fine on windows) until after the down-arrow button is clicked three times: 1) drops down the combo, but the scrollbars aren't resized. 2) raises the combo 3) drops down the combo with the scrollbars resized. Screenshots available here: http://chico.benjamindsmith.com/phpgtk_osx/dropdown/ Thanks, -Ben -- -- Only those who reach toward a goal are likely to achieve it. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.