hi . i have 6 parameters and 4 radiobuttons , for the first two radiobutton i need 2 parameters, for the 3rd radiobutton i need only one parameter and for the last radibutton i need all the parameters displayed in the seletion screen. i am a fresher learning abap and i do got the concept of modify screen for only two parameters which is either this or that kinda thing. so kindly help me out here with syntax for the above requirement.