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Undo the last operation in Edit

Title: Undo the last operation in Edit You may use Perform method with EM_UNDO message for undo operation, and you can use EM_CANUNDO message to determine whether an edit operation can be undone. procedure TForm1.Button1Click(Sender: TObject); begin Edit1.Perform(EM_UNDO, 0, 0); end; procedure TForm1.Edit1Change(Sender: TObject); begin if Edit1.Perform(EM_CANUNDO, 0, 0)&lt&gt0 then Button1.Enabled:=True; end;