Add button to SAP ALV tree toolbar using ABAP code

Insert the following code into the PBO of the screen after the ALV tree has been created.
   i.e after 'CALL METHOD gd_tree->set_table_for_first_display' has been executed.


*&-------------------------------------------------------------*
*&      CHANGE_TOOLBAR
*&-------------------------------------------------------------*
* get toolbar control
  call method gd_tree->get_toolbar_object
          importing
              er_toolbar = mr_toolbar.
  check not mr_toolbar is initial.
* add seperator to toolbar
  call method mr_toolbar->add_button
          exporting
              fcode     = ''
              icon      = ''
              butn_type = cntb_btype_sep
              text      = ''
              quickinfo = 'This is a Seperator'.         "#EC NOTEXT
* add Standard Button to toolbar (for Delete Subtree)
  call method mr_toolbar->add_button
          exporting
              fcode     = 'DELETE'           "Function code of button
              icon      = '@18@'             "Icon ID (see )
              butn_type = cntb_btype_button  "Button type
              text      = ''                 "Button text
              quickinfo = 'Delete subtree'.  "Quick info text
* add Dropdown Button to toolbar (for Insert Line)
  call method mr_toolbar->add_button
          exporting
              fcode     = 'INSERT_LC'         "Function code of button
              icon      = '@17@'              "Icon ID (see )
              butn_type = cntb_btype_dropdown "Button type
              text      = ''                  "Button text
              quickinfo = 'Insert Line'.      "Quick info text
* set event-handler for toolbar-control
  data: toolbar_event_receiver type ref to lcl_toolbar_event_receiver.
  create object toolbar_event_receiver.
  set handler toolbar_event_receiver->on_function_selected
                                                      for mr_toolbar.
  set handler toolbar_event_receiver->on_toolbar_dropdown
                                                      for mr_toolbar.

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