Child node is not getting for context

Hi

In my web dynpro app,  i am trying to set context   by using below code

          DATA lo_nd_employee TYPE REF TO if_wd_context_node.

           DATA lo_el_employee TYPE REF TO if_wd_context_element.

           lo_nd_employee = wd_context->get_child_node( name = wd_this->wdctx_employee ).

           lo_el_employee = lo_nd_employee->get_element( ).

lo_nd_employee is getting nodes but,     lo_el_employee = lo_nd_employee->get_element( ).

Not getting elements, lo_el_employee is still initail .