Binding XML attribute in Flex

Question

I have this variable in Model class:

[Bindable]
public var someXml:XML;

I've used BindingUtils to get notified when the XML changes:

BindingUtils.bindSetter(onChange, Model.getInstance(), "someXml");

private function onChange(value:Object):void {
    // do something
}

Function onChange gets triggered when I assign an XML to the variable, but not when I change some attribute of the XML:

Model.getInstance().someXml.@attr = "newValue";

Why?

Answer 1

Because XML isn't an EventDispatcher and so doesn't dispatch Change Events when it's contents change. It descends directly from Object, so there's no EventDispatcher.