tabel control with radio buttons

hi experts ,

i have one screen with three 5 fields and radio button . in program alos created same structure internal table . when i call a trasaction screen display with emty data but radio buttons with default 'x' value in first radio button . when i was change radio buttons values intable control .

when iam cliking radio button not changing . in step loop also corresponding function code also i written code and move the data to internal tabel . in pbo i moving internal tabel data to screen tabel control . but not gettting data . the before data only coming not correct i changed data .

any one sujject me .