I mean I have the following tree when everything is open.
node 1 (open)
node 1.1
node 1.2
node 1.3
node 2 (open)
node 2.1
node 2.2
node 2.3
But I would like to load only part of this tree and keep some elements closed
node 1 (closed) <- content is loaded already. Just show it when I click on it
node 1.1
node 1.2
node 1.3
node 2 (closed) <- needs to be loaded when I click on it
So for user it will look like
node 1 (closed)
node 2 (closed)