New nodes are loaded dynamically.
Tree is expanded to level 1, some nodes are autoexpanded also.
DND is working in between mode.
Node 1
Expanded to level 1
Node 2.1
Node 2.2
Expanded to level 2
Node 1
Expanded to level 1Node 2.1
Node 2.2
Expanded to level 2Node 1Expanded to level 1Node 2.1Node 2.2Expanded to level 2