Hi Chetan

I havent used this control, but the Help docmentation advises there is a a "Load All Nodes" property:

The Load All Nodes property is not selected by default. This means that data will be loaded on demand when expanding a node.

http://help.k2.com/onlinehelp/k2smartforms/userguide/4.6.10/default.htm#Tree.htm#DataSource

Hi Andrew,

Thanks for the reply. 

I solved the issue by calling the Expand Node method of tree control in view initialized and passing the value of the root node.

Thanks,

Chetan.