ADF treeTable automatic sort

I have a treeTable whose value I supply with my own ChildPropertyTreeModel. For the nodeStamp facet column sortable="true" and sortProperty="name". When the tree table first appears, the tree is not sorted and when I click the up or down triangles in the first column header, it does not sort at all. When I set the ChildPropertyTreeModel treeModel.setSortCriteria(criteria), where criteria is ArrayList of one SortCriterion("name", true), the treeModel is always sorted ascending even when I click the down triangle in the first column header.
Do I have to catch the up/down arrow event and modify my sort criterion myself, or is there a simple way to have the treeModel do it for me automcatically like a regular table does? If the former, how do I catch the event and determine the direction of the desired sort?
Thanks in advance.

As per - http://docs.oracle.com/cd/E12839_01/apirefs.1111/e12419/tagdoc/af_treeTable.html
Unlike the Table, the TreeTable does not support automatic sorting. The underlying TreeModel must support sorting by implementing it's sorting logic in the setSortCriteria(List criteria) method of the TreeModelOne of the ways you can do it is here - ADF Sortable TreeTable

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