Change ID of a Component in ExtJS

ExtJS: The Component manager instance’s all collection does not let you change an ID of a component.

Let’s say… you wanted to, anyway. Add this:

Ext.ComponentMgr.all.changeKey = function(oldkey, newkey) {
    var comp = this.map[oldkey];
    var index = this.indexOfKey(oldkey);
    this.keys[index] = newkey;
    this.map[newkey] = comp;
    delete this.map[oldkey];
};

Is there anything really wrong with this approach?