在类声明里：
METHODS handle_node_cm_req
FOR EVENT node_context_menu_request OF cl_gui_alv_tree
IMPORTING node_key menu. 右键弹出上下文
METHODS handle_node_cm_sel
FOR EVENT node_context_menu_selected OF cl_gui_alv_tree
IMPORTING node_key fcode sender. 删除数据
在类实现里：
METHOD handle_node_cm_req.
CALL METHOD menu->clear.
CALL METHOD menu->add_function
EXPORTING
fcode = 'DEL_SUBTREE'
text = text-901. "删除节点
ENDMETHOD. "handle_node_cm_req
METHOD handle_node_cm_sel.
DATA l_rc TYPE c.
CASE fcode.
WHEN 'DEL_SUBTREE'.
CALL FUNCTION 'POPUP_TO_CONFIRM_STEP'
EXPORTING
textline1 = 'Do you really want to delete'(902)
textline2 = 'this node and all its subnodes?'(903)
titel = 'Confirmation'(904)
cancel_display = ' '
IMPORTING
answer = l_rc.
IF l_rc EQ 'J'.
CALL METHOD sender->delete_subtree
EXPORTING
i_node_key = node_key.
CALL METHOD sender->frontend_update.
ENDIF.
ENDCASE.
ENDMETHOD.
在类事件注册中加入：
l_event-eventid = cl_gui_column_tree=>eventid_node_context_menu_req.
APPEND l_event TO lt_events.
set handler l_event_receiver->handle_node_cm_req for g_alv_tree.
set handler l_event_receiver->handle_node_cm_sel for g_alv_tree.
在PAI CASE ok_code中加入：
WHEN OTHERS.
CALL METHOD cl_gui_cfw=>dispatch.
ENDCASE.
CALL METHOD cl_gui_cfw=>flush.