It's not a good solution, but when you open a tree node with
setChildOpen(), the method return the Child TreeNode :
public TreeNode setChildOpen(int index, boolean open, boolean fireEvents) {
assertNotDestroyed();
checkChildBounds(index);
CellTreeNodeView<?> child = nodeView.getChildNode(index);
return child.setOpen(open, fireEvents) ? child.treeNode : null;
}
The setOpen() return True only when the TreeNode is not a leaf and is
closed, ans you ask to open the node.
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