How to refresh interal table in Webdynpro ABAP

Hi all,
I want to delete/free/refresh interal table in webdynpro abap.
One of the form gave solution to pass blank internal table?
I cleared node and itab in webdynpro, but internally SAP doesn't delete the context node and itab values.
Please help me in how to refresh itab in webdynpro abap.
Regards,
Prasad

Hi Srinivas,
it doesn't work.
I wrote like this in action list method.
method lta_task.
if not lcontext_node_task is intial.
context_node_task->invalidate().
endif.
select.......
populate data into internal table lt_task_output_table .
if not lt_task_output_table is inital.
context_node_task = wd_context->get_child_node( name = 'TASK_PER').
context_node_task->bind_table( wd_this->lt_task_output_table ).
endif.
endmethod.
Starting of the mehod i have written to inavlidate, before upating the itab
but donesn;t work. Where should I write the code
Reagards,
Prasad

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