Links in tree
	Xml for the tree:
	- 
		http://www.google.com
		- 
			http://groups.google.com
		
there is an event handler for click processing: 
tree.setOnClickHandler(doOnClick);
function doOnClick(nodeId){
	var myUrl = tree.getUserData(nodeId,“myurl“);
	window.open(myUrl);// or frames[“someframe“].location.href = myUrl
}
		
	
	
	Drag-n-drop outside tree