How do you do anything with XML in OO?

Inside callback handlers the class members are out of scope. You can solve this in several ways. One of them is using a local reference to the class:

var thisObj=this;
myxml.onLoad = function() {
thisObj.yourclassmember....

Another one is using the Delegate Class (hit F1 in Flash and search for Delegate). And you can use the events of a class in a much more easier way by just defining methods with the same name. Just look at how you use a listener.

Now, first of all, you can do a whole lot of things with XML in Flash. Secondly, Flash doesn't suck. But some people seem to hate books and help-files and just ventilate their frustrations on forums. Grow up.

That isn’t just a function. It’s an event handler. You need to reference your clips one wave up (its parent mc). Try adding one of the following as a prefix to what you are trying to connect to;

this._parent
this._parent._parent

But you shouldn’t be having any problems accessing ‘myxml’ properties inside this event handler. Post more code.