Actionscript 3 :: Flex Bindsetter On XML Object Tag?

I've got a XML object that is shared by some components. Is it possible to set a BindSetter to a specific tag and call a function if that property changes?I've tried it, but the BindSetter call doesn't seem to accept XML tag names.When simply using [Bindable] and using the the tag name in MXML (i.e. label text="{myXMLObject.tagName}") this works fine, so I figure this has to work in pure AS as well, I just haven't figured out how.shared Data Change doesn't do anything at this point, just tracing that the function has been called.I've then got a Label that displays the value of sharedData.tagName, a textInput and a button that sets sharedData.tagName = textInput.text.Using MXML binding ({label.text = sharedData.tagName}) this works fine. But as I said, the BindSetter function doesn't seem to detect the changes.