gtk_combo_box_set_focus_on_click(GTK_COMBO_BOX(GET_COMPONENT("comboLayer")), FALSE);
g_signal_connect(GET_COMPONENT("spinPageNo"), "activate",
G_CALLBACK(handle_activate_signal), NULL);
gtk_combo_box_set_focus_on_click(GTK_COMBO_BOX(GET_COMPONENT("comboLayer")), FALSE);
g_signal_connect(GET_COMPONENT("spinPageNo"), "activate",
G_CALLBACK(handle_activate_signal), NULL);