static/ext/src/ux/DataTip.js
function onHostRender() {
        var e = this.isXType('panel') ? this.body : this.el;
        if (this.dataTip.renderToTarget) {
            this.dataTip.render(e);
        }
        this.dataTip.setTarget(e);
    }
function onHostRender() {
        var e = this.isXType('panel') ? this.body : this.el;
        if (this.dataTip.renderToTarget) {
            this.dataTip.render(e);
        }
        this.dataTip.setTarget(e);
    }
Target the body (if the host is a Panel), or, if there is no body, the main Element.