Clean up hidden DOM nodes after extracting HTML.

            '{categories}'

        );

        var notice = Ext.get("notice-text");

        var guides = Ext.get("guides-content");

        var categories = Ext.get("categories-content");

        this.html = tpl.apply({

            // Use the same title as in <title>

            title: Ext.query("title")[0].innerHTML,

            // If page contains div with notice-text extract the text and show it as notice

            notice: notice && notice.dom.innerHTML,

            // Extract guides

            guides: guides && guides.dom.innerHTML,

            // Extract categories

            categories: categories && categories.dom.innerHTML

        });

        this.html = tpl.apply(this.extractData());

        this.callParent(arguments);

    },

    // Extracts HTML from hidden elements in page

    extractData: function() {

        var data = {

            notice: Ext.get("notice-text"),

            guides: Ext.get("guides-content"),

            categories: Ext.get("categories-content")

        };

        for (var i in data) {

            var el = data[i];

            if (el) {

                // If page contains the div then extract its contents,

                // after that remove the original

                data[i] = el.dom.innerHTML;

                el.remove();

            }

        }

        // Extract <title> text

        data.title = Ext.query("title")[0].innerHTML;

        return data;

    }

});