g_signal_connect (priv->button, "clicked", G_CALLBACK (button_clicked_cb), self);
g_signal_connect (priv->arrow, "clicked", G_CALLBACK (arrow_clicked_cb), self);
g_signal_connect (priv->button, "clicked", G_CALLBACK (button_clicked_cb), self);
g_signal_connect (priv->arrow, "clicked", G_CALLBACK (arrow_clicked_cb), self);