%subj - they are not public so I must use now dirty code:

1.
   procedure DoControlLock(Ctl: TWinControl);
2.
   begin
3.
   {$ifdef fpc}
4.
   if Application.MainForm<>nil then
5.
        TFormHack(Application.MainForm).BeginFormUpdate;
6.
   {$else}
7.
      Ctl.Perform(WM_SetRedraw, 0, 0);
8.
   {$endif}
9.
   end;

--
Regards,
Alexey

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