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TAdvRichEditor
Use TAdvRichEditor as logging tool

A technique that can be used to automatically scroll to the last line when programmatically adding lines for a logging system, is to set the caret to the last line with the SetCaret() method and then call AdvRichEditor.ScrollToCaret; Sample code:
begin
  advricheditor1.AddMultiLineText(''a new line ''+inttostr(t));
  advricheditor1.AddLineBreak;
  inc(t);

  advricheditor1.SetCaret(cpEndDoc);
  advricheditor1.ScrollToCaret;
end;