Comment 2 for bug 941612

StacktraceTop:
 switch_panel (self=0x7f104fdfa7a0, panel=0x7f102953726f "sound") at cc-bluetooth-panel.c:443
 sound_callback (button=<optimized out>, self=<optimized out>) at cc-bluetooth-panel.c:468
 _gtk_marshal_BOOLEAN__VOID (closure=0x7f1050086e70, return_value=0x7fff38e88b60, n_param_values=<optimized out>, param_values=<optimized out>, invocation_hint=<optimized out>, marshal_data=<optimized out>) at /build/buildd/gtk+3.0-3.3.16/./gtk/gtkmarshalers.c:916
 g_closure_invoke (closure=0x7f1050086e70, return_value=0x7fff38e88b60, n_param_values=1, param_values=0x7f10502e8e20, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.31.18/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=<optimized out>, emission_return=0x7fff38e88ca0, instance_and_params=0x7f10502e8e20) at /build/buildd/glib2.0-2.31.18/./gobject/gsignal.c:3302