Modal dialogs in Gtk

Can anyone explain why my modal dialogs are not freezing the screen?
I can click on the window behind the dialog window and the dialog
disappears.

dialog = Gtk::Dialog.new(Utils.getT("test"),
$main_application_window,
Gtk::Dialog::DESTROY_WITH_PARENT)

dialog.width_request = 600
dialog.modal = true
dialog.window_position = Gtk::Window::POS_CENTER_ALWAYS
dialog.transient_for = $main_application_window

........

Everything else about it works fine.

Bill

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