Tree doesn't update correctly
-----------------------------

                 Key: WICKET-3449
                 URL: https://issues.apache.org/jira/browse/WICKET-3449
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 1.4.8
         Environment: tomcat 6.0.14, win 7
            Reporter: Sergey Plevko
            Assignee: Igor Vaynberg
             Fix For: 1.4.11, 1.5-M2.1


When we add a first child to the node this update doesn't appeare in a browser. 
If we collapse/expand this the parent node forced we will see changes. All the 
rest updates work correctly.
This bug easily can be reproduced with the next pice of code.


TestPage.html 

<html xmlns="http://www.w3.org/1999/xhtml"; 
xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd";>
<body>
<table>
    <tr>        <td>            <div wicket:id="tree"></div>        </td>    
</tr>
    <tr>        <td>            <input type="submit" wicket:id="addChild" 
class="btn btnStd" />        </td>    </tr>
</table>
</body>
</html>

TestPage.java

public class TestPage extends WebPage {
    public TestPage() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        final DefaultMutableTreeNode rootChild = new 
DefaultMutableTreeNode("rootChild");
        root.add(rootChild);

        final DefaultTreeModel treeModel = new DefaultTreeModel(root);
        final BaseTree tree = new LinkTree("tree", treeModel);

        add(tree);
        tree.getTreeState().expandNode(root);

        AjaxLink addButton = new AjaxLink("addChild") {
            public void onClick(AjaxRequestTarget ajaxRequestTarget) {
                DefaultMutableTreeNode child = new 
DefaultMutableTreeNode("child");
                //rootChild.add(child); // it doesn't matter how we add this 
child
                treeModel.insertNodeInto(child, rootChild, 0);
                tree.updateTree(ajaxRequestTarget);
            }
        };
        add(addButton);
    }
}


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