Toolbar bug?

[mclos000 correu udg es]

I need to put my own pixmap on a toolbar, I use this:
{ 
GNOME_APP_UI_ITEM,
N_("Pause"), N_("Pause downloading the file(s)"),
pause_cb, NULL, NULL,
GNOME_APP_PIXMAP_DATA, pause_xpm,
0, (GdkModifierType)0, NULL
},
but when I disable it (gtk_widget_set_sensitive(widget, FALSE),
the pixmap won't disable, only the word under it (Pause).
Is this a bug or I'm doing something wrong?
Thanks.