Column Sizing synchronization

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I have two TAdvStringGrid on a Form for example master and Slave Grid

On the Master Grid I enable the option goColsizing then I try with the event OnColumnSizing  on the Master Grid  the same Column on the slave Grid to synchronize (width) with this code

procedure TForm1.gridmasterColumnSizing(Sender: TObject; ACol,

  ColumnSize: Integer);


  gridslave.ColWidths[Acol] := ColumnSize ;


but the result not reflect my wisch  

on click on the master grid to resize the slave column go wider than the master column

what am missing?

Best regards


Delphi 2010,  last TMS Grid