[alexcon314]

Flash 8: Unexpected file format.

Если по клику на Tree пытаетесь вытащить урл из хмл-а, почему не пишете прямо

function listChangedTr(evt_obj:Object) {
	trace(evt_obj.target.selectedNode.attributes.url);
}

С датагридом и вашим хмл-ом

var loadedXML = new XML();
loadedXML.ignoreWhite = true;
loadedXML.onLoad = function(s) {
	if (s) {
		var i = 0;
		var arr = new Array();
		while (this.firstChild.childNodes[i]) {
			arr[i] = this.firstChild.childNodes[i].attributes;
			i++;
		}
		my_dg.dataProvider = arr;
		my_dg.addEventListener("cellPress", _root);
	}
};
cellPress = function (evt_obj:Object) {
	var cind = evt_obj.target.getColumnAt(evt_obj.columnIndex).columnName;
	var iind = evt_obj.itemIndex;
	var cell_str:String = "(" + cind + ", " + iind + ")";
	trace("The cell at " + cell_str + " has been clicked");
	trace("The cell has value " + my_dg.dataProvider[iind][cind]);
};
loadedXML.load('data.xml');