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