Selected value in dropdown list box

hi forums,
how to capture the selected value in drop down list box and how it will link with the table.
layout:
    <htmlb:dropdownListBox id = "d1%>"
                            nameOfKeyColumn = "vbeln"
                          nameOfValueColumn = "vbeln"
                         table       = "<%=it_sales%>" />
in dropdown list box,how do i capture the selected values.
OnInitialization:
Select vbeln from vbak
into corresponding fields of table it_sales.
regards,
ravi.

hi Ravikiran,
   In button even,we r mension the event_type = 'click'.
but in dropdownListBox what is the event_type.
i tryed like this.
DATA : EVENT TYPE REF TO CL_HTMLB_EVENT.
***this is for button************
*event = CL_HTMLB_MANAGER=>get_event( RUNTIME->SERVER->REQUEST ).
*IF event->NAME = 'button' AND event->event_TYPE = 'click'.
DATA : button_event TYPE REF TO CL_HTMLB_EVENT_BUTTON.
button_event ?= event.
*ENDIF.
*********this is for dropdownListBox**********
event = CL_HTMLB_MANAGER=>get_event( runtime->server->request ).
IF event->name = 'dropdownListBox' AND event-         >event_type = 'selection'.
       DATA : dd_listbox_event TYPE REF TO CL_HTMLB_EVENT_SELECTION.
       dd_listbox_event ?= event.
CASE EVENT->ID.
when 'id1'.
CALL METHOD REQUEST->GET_FORM_FIELD
      EXPORTING
        NAME = 'id1'
      RECEIVING
        VALUE = SEL.
WHEN 'myButton'.
   CALL METHOD REQUEST->GET_FORM_FIELD
     EXPORTING
       NAME = 'id1'
     RECEIVING
       VALUE = SEL.
ENDCASE.
endif.
with regards,
ravi.

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Selected value in dropdown list box

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