Changing the Attachment List of Generic Object Services (GOS)

Dear Experts,
i want to add columns to the attachment list of GOS depending of the given objecttype. The data to be displayed is from a customer-append of different TOAXY-tables. I want to use the functionality of the standard attachmentlist, but the type of the displayed table is defined as SGOS_ATTA and cant be reached directly because of the data-encapsulation.
Is there anybody with experience in changing the attachment list in the above mentioned way?
Do i have to modify all the used classes of the attachmentlist, or are there any customer-exits/badis that can help me to reach my goal?
Or should I implement my own service from the scratch?
I hope you can help me, i searched the web for about 3 days now...

I found following Solution:
I copied the following classes and changed them in some way to fit my requirements:
1.CL_GOS_ATTACHMENTS
2.CL_GOS_SRV_ATTACHMENT_LIST
3.CL_LIST_BROWSER
Changes to the Classes:
1.Type of the attribute GO_INSTANCE changed to ZCL_GOS_ATTACHMENTS.
   Changed method INIT_BROWSER:
go_browser ?=
    zcl_list_browser=>zcreate_browser( cl_browser=>gc_list_browser ).
2.Type of the attribute GO_ATTACHMENT_LIST changed to ZCL_GOS_ATTACHMENTS
3. Copied Method CREATE_BROWSER of Class CL_BROWSER to ZCREATE_BROWSER:
method zcreate_browser.
case ip_btype.
    when gc_list_browser.
      *create object ro_browser type zcl_list_browser.*
    when gc_tree_browser.
      create object ro_browser type cl_tree_column_browser.
    when others.
      raise exception type cx_sobl_browser
        exporting
          gp_error = cx_sobl_browser=>gc_wrong_type
      exit.
endcase.
endmethod.
Modified the code of method ___DISPLAY to my needs.

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