display of grid

hi ppl, i m working on grids..i m a newbie...actually i have grid which has all the data that has been read from DB ....n i m able to display too.....but when i want to display a required row according to my search criteria ...i want to display the searched celldata on existing grid...wen i do tat...the whole page is getting blanked....nly the corresponding row is seen...plz can any help me out wit dis issue