gtk_box_pack_start (GTK_BOX (hbox), priv->button_edit, TRUE, FALSE, MODEST_MARGIN_HALF);
gtk_widget_show (priv->button_edit);
g_signal_connect (G_OBJECT (priv->button_edit), "clicked",
G_CALLBACK (on_button_edit), self);
gtk_box_pack_start (GTK_BOX (hbox), priv->button_edit, TRUE, FALSE, MODEST_MARGIN_HALF);
gtk_widget_show (priv->button_edit);
g_signal_connect (G_OBJECT (priv->button_edit), "clicked",
G_CALLBACK (on_button_edit), self);