I want to change the values for an Excel spreadsheet that are set
manually with File->page set up. Below is part of the code I am using.
All works fine except the $sheet->set_margins_LR which has not effect at all

    $workbook = $excel->Workbooks->Add;

       $sheet = $workbook->Worksheets("Sheet1");
    $sheet->Activate();       
    $sheet->{Name} = "Tool List";

    $sheet_margin = 2;
    $sheet->set_margins_LR($sheet_margin);
[download]

What should I be doing?