Hi,
Each time you double click on the cell of your ALV the method handle_double_click of class
lcl_gui_alv_event_receiver will be called and will respond to your action.
- define class and method for handling event
- register the method with SET HANDLER g_alv_event_ref->handle_double_click FOR g_alv_grid_ref to show which method will repond to your action.
- pls check this link ABAP Objects - ALV Model With Events - Using Link Click, Double Click & Button - Code Gallery - SCN Wiki