Adds each argument passed to this method to the {@link Ext.AbstractComponent#cfg-childEls childEls} array.
function () {
        var me = this,
            args = arguments;

        if (me.hasOwnProperty('childEls')) {
            me.childEls.push.apply(me.childEls, args);
        } else {
            me.childEls = me.getChildEls().concat(Array.prototype.slice.call(args));
        }
        
        me.prune(me.childEls, false);
    }