Sort Column Date - DataGrid - Flex 4.5.1

[Marcos Nunes]

Hi

I made download the function (below)  to sort column date in DateGrid, but
is not working

private function date_sortCompareFunc(itemA:Object, itemB:Object):int
{
   var dateA:Date=new Date(Date.parse(itemA.dob));
   var dateB:Date=new Date(Date.parse(itemB.dob));
   return ObjectUtil.dateCompare(dateA, dateB);
}

<s:GridColumn dataField="DATA_VENCIMENTO_ID"
    width="115"
    headerText="Data Vencimento"
    dataTipFunction="date_sortCompareFunc">

someone can help me?

Marcos Nunes