gdk-directfb flicker issue

Hi guys,

I am running GGL(Google Gadgets for Linux) based Gadget on my embedded linux
platform, and it runs on Gtk+(gtk+-2.16.0)/DirectFB, now i encounter some
flicker problem as follows:

1, If i move my mouse from one button to another button on the gadget, the
gadget flickers
2, If i move the mouse off the gadget, or make mouse entry into the gadget,
it flickers too

I've made some investigations:
1, the gadget flickers for redrawing, since we got the expose-event
2, the redrawing process is as follows:
   1) calling gdk_window_begin_paint_region() in gdk/gdkwindow.c
   2) then gdk_window_impl_directfb_begin_paint_region()
in gdk/directfb/gdkwindow-directfb.c
   3) next GGL expose-event handler is called
   4) then run gdk_window_end_paint() in gdk/gdkwindow.c
   5) last gdk_window_impl_directfb_end_paint()
in gdk/directfb/gdkwindow-directfb.c
3, I tried to make some modifications but without getting any positive

My question is:
1, it flickers for repeating redrawing the black-background and the gadget,
2, it is the expose-event that triggers the redrawing process, but we just
move the mouse? or why expose event take places together with mouse motion
3, is it for the gtk_propagate_event() in gtk/gtkmain.c? how to fix it?

It is greatly appreciated if you could give me some clues:)

Many thanks,

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