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Select First Node

How can i select ( tree.selectItem ) the first Node of a X Level if i don'y know the ID?

You can select item by index if you know its parentID

Select first item on top level
      tree.selectItem(tree.getItemIdByIndex(0,0));

Select first item in some branch where parent_if = PID
      tree.selectItem(tree.getItemIdByIndex(PID,0));