[maemo-developers] how to capture mouse event for a GtkWindow in maemo?

[From: chunlong yu]

I inherit the Gtk::Window ,overwrite it's virtual member function
on_button_press_event<http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1Widget.html#ba72b7f8655d1a0eb1273a26894584e3>(GdkEventButton*
event) and
on_button_release_event<http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1Widget.html#ba72b7f8655d1a0eb1273a26894584e3>(GdkEventButton*
event) ,
and add such codes in the construction function:
singal_button_press_event.connect(...)  and
singal_button_release_event.connect(....)
or   add such codes in the construction function
:add_events(Gdk::EventMask::.......).

Neither method can capture mouse event. how can i response mouse event for
a GtkWindow in maemo?
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