I have a tree and 2 nodes (derived from TreeNode)

Node1
|---Node2

if i selected a node in the tree i'm receive a callback

nodeSelected( NodeSelectedEvent event )

and i try to get the node

tree.getTreeNode( nodeKey );

and i'm receive some strange results

1 click -> TreeNodeImpl
2 click (other node) -> MyNode1
3 click (other node) -> TreeNodeImpl
...

i want get always MyNode1 and MyNode2. Why i'm receive TreeNodeImpl.
I have no TreeNodeImpl. Only MyNode1 and MyNode2

with tree i'm using setAjaxSubmitSelection(true);

any ideas? is it a bug?