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dhtmlXTree - Do not select tree node

Is there any way to prevent a node from being selectable?
I can make it not closeable (using setItemCloseable with a false param).
Now, when you click the + or double click the node, it does not expand/contract the children.
But it does still select the node.

I want to be able to specify for one node in my tree, that it is non selectable.
And the previously selected node remains selected even if I click on this non-selectable node.
So something like setItemSelectable(itemID, flag)?

There is no such API, but you can use code similar to next

tree.attachEvent("onSelect",function(id){
      if (id == SOME)
             tree._unselectItem(tree._idpull[id]);
      return true;
});