ALV grid disply with edit columns in output

Hi all,

i am using CALL METHOD MY_GRID->SET_TABLE_FOR_FIRST_DISPLAY

to display the output in alv format.there is 3 edit columns in output display.

if i fill one field & then put 'ENTER' then other two fields of that row should be filled with the appropriate data from the program.still control should be in output display.

which method i should use to go inside the program when i put 'ENTER' on any field of ALV output disply & how to use those methods inside the program.

i need some materials regarding OOPS (class, method ) . now i want to put OOPS concept in alv display.

correct answers will be rewarded.

Thanks & regards