Override focusInvalid to handle switching tab focus :
		focusInvalid: function() {
			if( this.settings.focusInvalid ) {
				try {

					var element = jQuery(this.findLastActive() || this.errorList.length && this.errorList[0].element || []).filter(":visible"); 
					element.parents('#container-1').triggerTab( element.parents(".fragment")[0].id.replace("fragment-","")*1 );
					element.focus(); 


				} catch(e) { /* ignore IE throwing errors when focusing hidden elements */ }
			}
		},

This modification works perfectly in firefox, but in IE does not work.