用user_command事件，如下是OO的方式：
CLASS cl_event_receiver DEFINITION.
PUBLIC SECTION.
METHODS:
handle_user_command FOR EVENT user_command OF cl_gui_alv_grid
IMPORTING e_ucomm.
ENDCLASS.
CLASS gcl_event_receiver IMPLEMENTATION.
METHOD handle_user_command.
PERFORM before_user_command USING e_ucomm.
ENDMETHOD.
ENDCLASS.
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