Tree : partial loading

[Alinto]

Hello,
i need to draw a treegrid with this schema :

- node1
   + node1.1
   + node1.2
   + node1.3
+ node2
+ node3

On the one hand, datas of "note1" would be entirely send by server, on the other hand datas of other nodes must be loaded when user would open them.

Is there any way to do this ?

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Smartgwt 2.4