rem: this.setActiveStyle(this._box.style.visibility == "visible"); 
add: this.setActiveStyle(this._box.style.display == "block"); 
context:     setStyle: function(name, value) {        this.$.setStyle.apply(this, [name, value]);                if (name == "backgroundColor") {            this._tab.style.backgroundColor = value;        } else if (name == "borderSize") {            var borderSize = this.getStyle("borderSize");            this._tab.style.lineHeight = tw_TabFolder._tabsHeight - (tw_sizeIncludesBorders ? borderSize : borderSize * 2) + "px";            this._borderBox.style.borderBottomWidth = "0px";            this.setActiveStyle(this._box.style.visibility == "visible");        }    },
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/24e02545b42a490e7acd2cb4e45328f823b29e40/TabSheet.js/clean/src/thinwire/render/web/resources/TabSheet.js