How to get only expanded node after open & close in CL_GUI_ALV_TREE?

Hi,
I have a tree structure using CL_GUI_ALV_TREE.
I would like to capture only the expanded nodes AFTER open and close operation.
If the user opens all the nodes and then closes them, I get all the nodes when using GET_EXPANDED_NODES.
I want to get only the expanded nodes that the user currently sees on the screen (so in open and close you will not get it as open).
whatever I tried doesn't work.
Do you have any idea how to do it?
Thanks,
Itay

this methods calls method of attribute MR_COLUMN_TREE without setting the parameter NO_HIDDEN_NODES to 'X'
that's why you get every node that is "open" even if not "visible"
as this attribute MR_COLUMN_TREE is protected, you cannot access it...
you should consider using an object of class CL_GUI_COLUMN_TREE directly in place of CL_GUI_ALV_TREE so that you can call the method with this parameter set...
you will have far more to do by hand but you will get more flexibility...

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REPORT YFIIN_REP_TREE_STRUCTURE no standard page heading.
                   I N I T I A L I Z A T I O N
INITIALIZATION.
AUTHORITY-CHECK OBJECT 'ZPRCHK_NEW' :
                  ID 'YFIINICD' FIELD SY-TCODE.
IF SY-SUBRC NE 0.
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Public section
public section.
    class-methods init_screen.
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Private section
private section.
    data: container1 type ref to cl_gui_custom_container,
          container2 type ref to cl_gui_custom_container,
          tree type ref to cl_gui_simple_tree.
    methods: fill_tree.
endclass.
Class for Handling Events
class screen_handler definition.
Public section
public section.
    methods: constructor importing container
               type ref to cl_gui_custom_container,
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               for event node_double_click
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private section.
endclass.
*&                        Classes implementation
class screen_init implementation.
*&                        Method INIT_SCREEN
method init_screen.
    data screen type ref to screen_init.
    create object screen.
endmethod.
*&                        Method CONSTRUCTOR
method constructor.
    data: events type cntl_simple_events,
          event like line of events,
          event_handler type ref to screen_handler.
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endmethod.
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method fill_tree.
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          node type abdemonode.
types:    begin of tree_node,
          folder(50) type c,
          tcode(60) type c,
          tcode1(60) type c,
          tcode2(60) type c,
          text(60) type c,
          text1(60) type c,
          text2(60) type c,
          end of tree_node.
data: wa_tree_node type tree_node,
            t_tree_node type table of tree_node.
wa_tree_node-folder = text-001.
wa_tree_node-tcode = text-002.
wa_tree_node-text = 'Creditors ageing'.
wa_tree_node-tcode1 = text-003.
wa_tree_node-text1 = 'GR/IR aging'.
wa_tree_node-tcode2 = text-004.
wa_tree_node-text2 = 'Bank Balance'.
append wa_tree_node to t_tree_node.
clear wa_tree_node .
wa_tree_node-folder = text-005.
wa_tree_node-tcode = text-006.
wa_tree_node-text = 'Creditors ageing'.
wa_tree_node-tcode1 = text-007.
wa_tree_node-text1 = 'Creditors ageing'.
wa_tree_node-tcode2 = text-008.
wa_tree_node-text2 = 'Creditors ageing'.
append wa_tree_node to t_tree_node.
clear wa_tree_node .
wa_tree_node-folder = text-009.
wa_tree_node-tcode = text-010.
wa_tree_node-text = 'Creditors ageing'.
wa_tree_node-tcode1 = text-011.
wa_tree_node-text1 = 'Creditors ageing'.
wa_tree_node-tcode2 = text-012.
wa_tree_node-text2 = 'Creditors ageing'.
append wa_tree_node to t_tree_node.
clear wa_tree_node .
node-hidden = ' '.                 " All nodes are visible,
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    node-isfolder = 'X'.                                    " a folder,
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      at new folder.
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        clear node-relatship.
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class screen_handler implementation.
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method constructor.
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when 'Usr_Authn'.
submit YFIIN_REP_USERAUTHRIZATION via selection-screen and return.
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Program execution ************************************************
load-of-program.
call screen 9001.
at selection-screen.
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*&      Module STATUS_9001 OUTPUT
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module status_9001 output.
set pf-status 'SCREEN_9001'.
set titlebar 'TIT_9001'.
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*&      Module exit_9001 INPUT
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module exit_9001 input.
case sy-ucomm.
when 'EXIT'.
set screen 0.
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you can read the table node_table with nody key value which imports when docubble click the the tree node (Double clifk event).
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Hello,
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