src/TabBar/TabBar.js
function () {
		var result = 0;
		utils.forEach(
			this.$.tabs.getControls(),
			function (tab){
				var w = tab.origWidth() ;
				// must add margin and padding of inner button and outer tab-item
				result += w + 18 ;
			}
		);
		return result;
	}
function () {
		var result = 0;
		utils.forEach(
			this.$.tabs.getControls(),
			function (tab){
				var w = tab.origWidth() ;
				// must add margin and padding of inner button and outer tab-item
				result += w + 18 ;
			}
		);
		return result;
	}
function ( ) { var result = 0 ; utils . forEach ( this . $ . tabs . getControls ( ) , function ( tab ) { var w = tab . origWidth ( ) ; // must add margin and padding of inner button and outer tab-item result += w + 18 ; } ) ; return result ; }
compute tab width by adding width of tabs contained in tab bar.

@private
compute tab width by adding width of tabs contained in tab bar .