function (panel, destroy) {
                var index = util.indexOf(panel, this.get('body').get('children'));
                return this.removeItemAt(index, destroy);
            }
function (panel, destroy) {
                var index = util.indexOf(panel, this.get('body').get('children'));
                return this.removeItemAt(index, destroy);
            }
function ( panel , destroy ) { var index = util . indexOf ( panel , this . get ( 'body' ) . get ( 'children' ) ) ; return this . removeItemAt ( index , destroy ) ; }
remove item by specified panel
@param {KISSY.Tabs.Panel} panel
@param {Boolean} destroy whether destroy specified tab and panel
@chainable
remove item by specified panel