gtk_tool_item_set_is_important (priv->previous_button, TRUE);
gtk_widget_set_tooltip_text (GTK_WIDGET (priv->previous_button),
_("Find previous occurrence of the search string"));
gtk_tool_item_set_is_important (priv->previous_button, TRUE);
gtk_widget_set_tooltip_text (GTK_WIDGET (priv->previous_button),
_("Find previous occurrence of the search string"));