reg - dropdownlist and Table

hi all

i have a requirement in my application

i have view with two UI element one is a Table i.e., a Nested Tree Table which is on top and a DropDownKey list below the table. The Dropdown contains Student, Employee, Faculty and so on. When i select a particular key element in dropdown corresponding data should be displayed in the table above.

what i think for this i need to go for GridLayout Viewset

and my problem should i make 3 different tables for different keys or else one table with 3 different java classes i.e., whenever i select a key that corresponding data should be loaded dynamically into the table at runtime.

please guide me

Thanks and Regards

khaja