HI SCN People,
For List
Web Dynpro Components/Interfaces - FPM_LIST_UIBB_ATS
In Case of Class - I used Interface (IF_FPM_GUIBB_LIST) & written the code in a method (IF_FPM_GUIBB_LIST~GET_DEFINITION)
method IF_FPM_GUIBB_LIST~GET_DEFINITION.
eo_field_catalog ?= cl_abap_structdescr=>describe_by_name( 'structure_name' ).
endmethod.

Thank You,
Suggu Sandeep.