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Tags: FALV
The latest version of each part of FALV can be found on github repository https://github.com/fidley/falv which you can use in abapGit for easier up to date handling. 
 
This demos shows how to add / remove / disable / enable grid toolbar buttons. As you can notice on video with the demo program, all this functions works also during runtime of program.

"! This is demo for FALV grid button adding, deleting, enabling, disabling
"! done by Lukasz Pegiel for http://abapblog.com
report zdemo_falv05.


datasflight type standard table of sflight.


class lcl_test definition inheriting from zcl_falv.
  public section.

  protected section.
    "redefinition of event handler
    methods evt_user_command redefinition.
  private section.

endclass.

class lcl_test implementation.

  method evt_user_command.
    case e_ucomm.
      when zcl_falv_dynamic_status=>b_01.
        me->enable_buttonme->mc_fc_print_back ).
      when zcl_falv_dynamic_status=>b_02.
        me->disable_buttonme->mc_fc_print_back ).
        me->add_button(
          exporting
            iv_function  zcl_falv_dynamic_status=>b_03
             iv_icon      icon_alarm
        ).
      when zcl_falv_dynamic_status=>b_03.
        me->delete_buttonzcl_falv_dynamic_status=>b_03 ).
    endcase.
  endmethod.

endclass.

start-of-selection.


  select up to 100 rows
  into corresponding fields of table @sflight
  from sflight.

  "creation of falv with local redefinition
  data falv type ref to lcl_test.
  falv ?= lcl_test=>createexporting  i_subclass cl_abap_classdescr=>describe_by_namep_name 'LCL_TEST' )
                              changing ct_table sflight    .

  "Add title variable
  falv->title_v1 'ZDEMO_FALV05'.

  "Set Gui status to fully dynamic (no standard buttons of ALV Grid)
  falv->gui_status->fully_dynamic abap_true.

  "Add button into GUI status at for function F01 (in partial dynamic GUI Status we can have up to 19 buttons)
  falv->gui_status->add_button(
    exporting
      iv_button              zcl_falv_dynamic_status=>b_01
      iv_text                'Enable Print'
      iv_icon                icon_activate
*      iv_qinfo               =
*      iv_allowed             = ABAP_TRUE
    exceptions
      button_already_filled  1
      button_does_not_exists 2
      icon_and_text_empty    3
      others                 4
  ).
  if sy-subrc <> 0.
  endif.
  "Add button into GUI status at for function F02
  falv->gui_status->add_button(
    exporting
      iv_button              zcl_falv_dynamic_status=>b_02
      iv_text                'Disable Print'
      iv_icon                icon_active_inactive
*      iv_qinfo               =
*      iv_allowed             = ABAP_TRUE
    exceptions
      button_already_filled  1
      button_does_not_exists 2
      icon_and_text_empty    3
      others                 4
  ).
  if sy-subrc <> 0.

  endif.


  "In default when we use full screen FALV, Grid toolbar is switched off, we must turn it on )
  falv->layout->set_no_toolbarabap_false ).

  "we Add buttons to ALV grid toolbar, I'll use same function like in GUI status
  falv->add_button(
    exporting
      iv_function  zcl_falv_dynamic_status=>b_01
      iv_icon      icon_activate
*      iv_quickinfo =
*      iv_butn_type =
*      iv_disabled  =
       iv_text      'Enable Print'
*      iv_checked   =
  ).
  "we Add buttons to ALV grid toolbar, I'll use same function like in GUI status
  falv->add_button(
    exporting
      iv_function  zcl_falv_dynamic_status=>b_02
      iv_icon      icon_active_inactive
*      iv_quickinfo =
*      iv_butn_type =
*      iv_disabled  =
       iv_text      'Disable Print'
*      iv_checked   =
  ).

  "remove button "Details" & "Info" from standard Grid functions
  falv->delete_buttonfalv->mc_fc_detail ).
  falv->delete_buttonfalv->mc_fc_info ).
  "Display full screen grid
  falv->display).

 
 
 
Video with demo program