<public:method name="databindTypes" />
    <public:method name="getChildren" />
    //insert the following line
    <public:method name="navigateNode" />
</public:component>

//Get the treeview object -
//getElementByID will expect the name of your treeview

TreeView = document.getElementById('TheFullName_TreeView1');

//Get the Node you require by using getTreeNode
//selectedNodeIndex get/sets the index as dot notation
//In the behaviour you will see the explanation as
//         A
//     / | \
//     B C D
//     / \ / \
//    E F G H
// node F is 0.0.1, node G is 0.2.0, and H is 0.2.1.

var node = TreeView.getTreeNode(TreeView.selectedNodeIndex);

if (node!=null)
{
    //Navigate using our new public method
    TreeView.navigateNode(node);
}