DataTable parent row is null

[Mike]

How do I get the parent rows populated in the following scenario..

VirtualManagerTableAdapters.ShiftDataTableAdapter ta = new
VirtualManagerTableAdapters.ShiftDataTableAdapter();
foreach (VirtualManager.ShiftDataRow row in ta.GetData().Rows)
{
total += row.StaffRow.Wage;
}

StaffRow is always null, which is a parent row of ShiftDataRow. Should
this get populated for me, or am I missing something...

- TIA