How to disable "Expand All" and "Collapse All" when no node in a tree

I have a <af:tree> inside <af:panelCollection>.
All items under viewMenu like "Expand", "Expand All Below", "Collapse All Below", "Expand All" , "Collapse All", "Scroll to First" and "Scroll to Last" are implemented by default.
When there is no node in a tree, "Expand", "Expand All Below", and "Collapse All Below" are grey out.
However, "Expand All" , "Collapse All", "Scroll to First" and "Scroll to Last" are still enabled to be clicked.
Is there any way we can diable them when no node?

When I highlight last node in the tree and all nodes are collapsed, I see "Expand All Below" enabled but "Collapse All Below" disabled. Which is expected. Expand All Below will expand all the child nodes under a node.
QA filed a bug said that "Expand All Below" should be disabled since no node below it. However, I don't find any place to control them. Can you confirm this? Or you know some way to do this?It it not a bug then. You don't have to control it and framework takes care of enabling and disabling it accordingly.
If you need to expand all the nodes programatically, check this out.
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/78-man-expanding-trees-treetables-354775.pdf
-Arun

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How to disable "Expand All" and "Collapse All" when no node in a tree

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