GTK-DirectFB clean-up problems

[Iulian <iliescu iulian gmail com>]

I have GTK over DirectFB on a linux platform.
I have a simple GTK application with only one window at which i connected
"destroy" signal on which i call gtk_main_quit().
I've installed signal handlers for SIGINT and SIGTERM
When i catch one of these signals i call
gtk_widget_destroy(GTK_WIDGET(main_window));

Unfortunatelly the application doesn't close gracefully (it doesn't clean-up
DirectFB) and i got:
 (!!!)  *** WARNING [Application exited without deinitialization of
DirectFB!] *** [core.c:859 in dfb_core_deinit_check()]
 (!!!)  *** WARNING [still objects in 'Window Pool'] *** [object.c:241 in
fusion_object_pool_destroy()]
 (!!!)  *** WARNING [still objects in 'Layer Region Pool'] *** [object.c:241
in fusion_object_pool_destroy()]
 (!!!)  *** WARNING [still objects in 'Layer Context Pool'] ***
[object.c:241 in fusion_object_pool_destroy()]
 (!!!)  *** WARNING [still objects in 'Surface Pool'] *** [object.c:241 in
fusion_object_pool_destroy()]
Interface instances remaining (8): 
  - 'IDirectFB' at 0x229ec00 (dfb) allocated in DirectFBCreate (directfb.c:
197)
  - 'IDirectFBDisplayLayer' at 0x22a1400 (*context->interface) allocated in
GetDisplayLayer_Callback (idirectfb.c: 1810)
  - 'IDirectFBInputDevice' at 0x22a14a8 (*context->interface) allocated in
GetInputDevice_Callback (idirectfb.c: 1838)
  - 'IDirectFBSurface' at 0x22a6930 (iface) allocated in
IDirectFB_CreateSurface (idirectfb.c: 819)
  - 'IDirectFBWindow' at 0x22a7080 (*window) allocated in
IDirectFBDisplayLayer_CreateWindow (idirectfbdisplaylayer.c: 670)
  - 'IDirectFBSurface' at 0x22a7158 (*surface) allocated in
IDirectFBWindow_GetSurface (idirectfbwindow.c: 354)
  - 'IDirectFBEventBuffer' at 0x22a7570 (iface) allocated in
IDirectFB_CreateEventBuffer (idirectfb.c: 1048)
  - 'IDirectFBSurface' at 0x22b8b40 (iface) allocated in
IDirectFB_CreateSurface (idirectfb.c: 819)


What is the problem?
What is the proper way to terminate a GTK application?
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