Filling a combo in the table structure

Hi,

In webdynpro, I have a table structure in which I want to fill a combobox programatically.

I am using following code for filling combo

ISimpleTypeModifiable employee=wdThis.wdGetAPI().getContext().getModifiableTypeOf("Employee");

//Employee is a context of the combobox

IModifiableSimpleValueSet EMP_Val =employee.getSVServices().getModifiableSimpleValueSet();

In the above code, if value of one combo is changed, all other combos in other rows gets similar values.

How should I assign context to the dropdown so that a dropdown in each row gets seperatly identified?

Thanks,

Ashutosh.