Hotspot in ALV BLOCK LIST

Hi,

i want to create a drill down report using ALV BLOCK LIST.I have created a form named USER COMMAND and set as i_calback_user command parameter in REUSE_ALV_BLOCK_LIST_INIT function.But when i clicks on the grid,it won't display the subreport.Please help me to solve this problem

regards,

Ajas P Thomas

SAP ABAP Consultant