WebDynPro how to read value from a table with button.

Recent task was given by Chin Yc. which to add a button to on of the column in all the rows.

Which supposed to show notes.

How does the button proceed to read from the table? below are the sample coding

"get exercise informations
DATA lo_nd_ess_profile TYPE REF TO if_wd_context_node. "READING NODES
DATA lo_el_ess_profile TYPE REF TO if_wd_context_element"READING NODES
DATA ls_ess_profile TYPE wd_this->Element_ess_profile."READING NODES
"The nodes referred named ess_profile
" Set Lead Selection on user selected row
" (the row where user clicked the Exercise button on)
"Getting the current node valuelo_nd_ess_profile = wd_context->get_child_node( name = wd_this->wdctx_ess_profile ).
lo_el_ess_profile = wdevent->get_context_element( name = 'CONTEXT_ELEMENT' ).
lo_nd_ess_profile->set_lead_selection( element = lo_el_ess_profile ).
lo_el_ess_profile->get_static_attributes(
IMPORTING
static_attributes = ls_ess_profile ).

DATA: whatevervalue type char255, whatevervalue1 type char255.
whatevervalue = ls_ess_profile-endda.
whatevervalue2 = ls_ess_profile-begda