Context Changed Values

Hi Friends,

I have a scenario in which one of the UI input element is Text field and when ever only the user changes that it should update i tried with the below code but i am not getting the Context that is getting modified , please guide me is there any steps left.

The below code is triggered in WDDOINIT

DATA:lo_context TYPE REF TO if_wd_context,

        lt_list    TYPE        wdr_context_change_list.

   lo_context = wd_context->get_context( ).

   CALL METHOD lo_context->enable_context_change_log.

The below code is triggered in WDDOMODIFYVIEW

DATA:lo_context TYPE REF TO if_wd_context,

        lt_list    TYPE        wdr_context_change_list.

   lo_context = wd_context->get_context( ).

   CALL METHOD lo_context->get_context_change_log

*    EXPORTING

*      and_reset   = ABAP_TRUE

     RECEIVING

       change_list = lt_list.

finally LT_LIST remains empty which is the issue.

Regards,

Vinodkumar.