protected void MovePageDown_Click(object sender, ImageClickEventArgs e)
    {
        Util util = new Util();
        Hashtable State = (Hashtable)HttpRuntime.Cache[Session.SessionID];
        if (util.CheckSessionTimeout(State, Response, "Default.aspx")) return;

        if (SavedCanvasHtml.Text.Length > 0)
        {
            if (!SavePage())
                return;
        }
        if (State["SelectedApp"] == null)
            return;
        XmlUtil x_util = new XmlUtil();
        x_util.MovePageDown(State);
        InitAppPages();
    }