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        protected override void OnPreRender( EventArgs e )
        {
            base.OnPreRender( e );

            //link the css file
            this.lASTreeViewThemeCssFile.Text = "<link id='astreeviewcssfile' href='' type='text/css' rel='stylesheet' />";

            string script = string.Format( "document.getElementById('astreeviewcssfile').href='{0}'", this.astvMyTree.ThemeCssFile );
            ScriptManager sm = ScriptManager.GetCurrent( this.Page );
            if( sm != null && sm.EnablePartialRendering )
                ScriptManager.RegisterStartupScript( this, this.GetType(), "js" + Guid.NewGuid().ToString(), script, true );
            else
                this.ClientScript.RegisterStartupScript( this.GetType(), "js" + Guid.NewGuid().ToString(), script, true );

        }

        protected void btnRightLeft_Click( object sender, EventArgs e )
        {
            ASTreeViewTheme rightLeft = new ASTreeViewTheme();
            rightLeft.BasePath = "~/javascript/astreeview/themes/right-left/";
            rightLeft.CssFile = "right-left.css";
            this.astvMyTree.Theme = rightLeft;
            this.astvMyTree.EnableTreeLines = true;
            this.astvMyTree.EnableRightToLeftRender = true;
        }

        protected void btnThemeMacOS_Click( object sender, EventArgs e )
        {
            ASTreeViewTheme macOS = new ASTreeViewTheme();
            macOS.BasePath = "~/javascript/astreeview/themes/macOS/";
            macOS.CssFile = "macOS.css";
            this.astvMyTree.Theme = macOS;
            this.astvMyTree.EnableTreeLines = false;
            this.astvMyTree.EnableRightToLeftRender = false;
        }