Santosh,
When you are done with defining all your fields.
Use At selection-screen before
IF SY-UCOMM = 'CL1'.
CALL SELECTION-SCREEN 200 STARTING 10 10 ENDING AT 100 10.
ENDIF.
http://wiki.sdn.sap.com/wiki/display/ABAP/Selection+Screen+Events+in+ABAP
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