gtk_widget_set_no_show_all (priv->attachments_caption, FALSE);
gtk_widget_show_all (priv->attachments_caption);
gtk_text_buffer_set_modified (priv->text_buffer, TRUE);
gtk_widget_set_no_show_all (priv->attachments_caption, FALSE);
gtk_widget_show_all (priv->attachments_caption);
gtk_text_buffer_set_modified (priv->text_buffer, TRUE);