* objects from showing through.
*
* @return the new shim element
*/
private El createShim() {
El el = new El(DOM.createIFrame());
el.dom.setPropertyString("frameborder", "no");
el.dom.setPropertyString("frameBorder", "no");
el.dom.setClassName("ext-shim");
el.setTabIndex(-1);
el.setVisibility(true);
el.setVisible(false);
el.addStyleName("x-ignore");
if (GXT.isIE && GXT.isSecure) {
el.dom.setPropertyString("src", GXT.SSL_SECURE_URL);
}
Accessibility.setRole(el.dom, "presentation");