extending dijit.tooltip

gistfile1.txt

dojo.declare("app.errorTooltip", dijit.Tooltip, {
    show: function() {
        var elem = dojo.byId(this.connectId[0]);
        if(dojo.isIE) {
            elem.fireEvent('onfocus');
        } else {
            var e = document.createEvent("HTMLEvents");
            e.initEvent('focus', false, true);
            elem.dispatchEvent(e);
        }
    }
});