Hello Suma,
As you want to display data in tab-1 as soon as the application is launched,there are two ways to achieve it.
1) As Narasimha and Shravan mentioned,write the code in WDDOINT( ) method of the controller
Else.
2)Fill the node(which you have binded to the table) initially using supply function.
Either of the two points may resolve your issue.
Thanks
Katrice