How to identify the sender in an event handler of alv grid

Hi,

I have two objects of a cl_gui_alv_grid class, both tied to the same event handler object.

In handling the user_command event of cl_gui_alv_grid, I need to know which one of both grids is actually the one calling. ( I need to know which internal table to edit)

How do I do that as you only receive the sy-ucomm and that's it?

Thanks in advance