用事件类实现双击事件，实例化后使用set handler注册到ALV对象。斜体部分为事件方法的具体实现。

代码如下

CLASS lcl_tree_event_receiver DEFINITION.

　　PUBLIC SECTION.

　　　　METHODS handle_node_double_click FOR EVENT node_double_click OF cl_gui_alv_tree

　　　　　　IMPORTING node_key sender.

ENDCLASS.

CLASS lcl_tree_event_receiver IMPLEMENTATION.

　　CALL METHOD cl_gui_cfw=>set_new_ok_code

　EXPORTING new_code = 'BACK'.

　　CALL METHOD cl_gui_cfw=>flush.　　

　　ENDMETHOD.

ENDCLASS.