new ClickHandler() {
public void onClick(ClickEvent event) {
FastTreeItem selectedItem = topTree.getChild(0).getChild(1);
Window.alert("Disowning " + selectedItem.getText() + " Child Nodes");
selectedItem.becomeLeaf();
btnAdd.setVisible(true);
}
});
topTree.addBeforeCloseHandler(new BeforeCloseHandler<FastTreeItem>() {