setTitle(title) {
        const me = this,
            container = me._container;

        me._title = title;
        if (container) {
            container.querySelector('#panel-title').innerHTML = title;
        }

        return me;
    }
Sets the panel's title to a string of text.
@param {string} title - The title of the panel
@returns {Panel} Returns itself to allow for method chaining