Getting an event fired every time when i click onto body part in classical

Dear Sir,

I have stuck up with a problem, in my double list block classical report, when i click onto the header or body part of classical report... i get an event fired every time..

when i check the form

FORM USER_COMMAND USING R_UCOMM LIKE SY-UCOMM

RS_SELFIELD TYPE SLIS_SELFIELD.

i get every time r_ucomm field with the same value...!!!!

How to resolve the problem..

Thanks & Regards,

Nirav Parekh