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"Besides, wx apps for the sake of "same code everywhere" do not use most of the things that make a gtk2 app good: no sizers (fixed size app, just like your average VB6 app), no native fileselector, dropdown and combos custom made and very strange, etc."
I'm not sure where you got that information from. wxWidgets has layout systems similar to Gtk (tables, boxes, etc.), and on Windows will use the native Windows file chooser. On Linux, it will use the Gtk one.