Try casting the GridStyleInfo to a GridTableStyleInfo object. Once it is a GridTableStyleInfo, you can try to get the GridRecordRow, and from there get at the for for the row.
GridTableCellStyleInfo tStyle = style as GridTableCellStyleInfo;
if(tStyle != null)
{
GridRecordRow grr = tStyle.TableCellIdentity.DisplayElement as GridRecordRow;
if(r != null)
{
DataRowView drv = grr.GetData() as DataRowView;
if(drv != null)
{
Console.WriteLine(drv["Col1"]);
}
}
}