lib/Ext/dom/Element.style.js
function(className) {
        //<debug warn>
        Ext.Logger.deprecate("Ext.dom.Element.radioCls() is deprecated", this);
        //</debug>

        var cn = this.dom.parentNode.childNodes,
            v;
        className = Ext.isArray(className) ? className : [className];
        for (var i = 0, len = cn.length; i < len; i++) {
            v = cn[i];
            if (v && v.nodeType == 1) {
                Ext.fly(v, '_internal').removeCls(className);
            }
        }
        return this.addCls(className);
    }
function(className) {
        //<debug warn>
        Ext.Logger.deprecate("Ext.dom.Element.radioCls() is deprecated", this);
        //</debug>

        var cn = this.dom.parentNode.childNodes,
            v;
        className = Ext.isArray(className) ? className : [className];
        for (var i = 0, len = cn.length; i < len; i++) {
            v = cn[i];
            if (v && v.nodeType == 1) {
                Ext.fly(v, '_internal').removeCls(className);
            }
        }
        return this.addCls(className);
    }
Adds one or more CSS classes to this element and removes the same class(es) from all siblings.
@deprecated 2.0.0
@param {String/String[]} className The CSS class to add, or an array of classes.
@return {Ext.dom.Element} this