Using VS .Net 2002 and Framework 1.0, all updates.

I've created a simple test project to illustrate my problem based on
the Pubs database.  Using a windows form, I've added a few textboxes,
navigation buttons, dataset refresh button and a couple of datagrids
for debugging purposes.  Using simple select statement data adapters
(no insert, update or delete), I populate Employee, Jobs and
Publishers tables in my dataset.  I create datarelations between the
Employee and Jobs tables, Employee and Publishers tables
(enforceconstraints = false).  I bind the datarelation textboxes as
follows (example):

this.textBox1.DataBindings.Add(new
System.Windows.Forms.Binding("Text", this.objEmployeeDS,
"Employee.rlJobs.job_desc"));

where rlJobs is the datarelation name.

When I run the program, textboxes are filled as expected.  I can
navigate through all employees, textboxes are all displaying the
correct data.

The problem is when I refresh the dataset as follows:

TabcontrolDemo.employeeDS objTemp;
objTemp = new TabcontrolDemo.employeeDS();
objTemp.EnforceConstraints = false;
try
{
    pubsConn.Open();
    employeeDA.Fill(objTemp);
    jobsDA.Fill(objTemp);
    publishersDA.Fill(objTemp);

    this.objEmployeeDS.Clear();    // Get rid of previous contents
    this.objEmployeeDS.Merge(objTemp);  // Merge to supposedly preserve
databinding
}

Textboxes that have no datarelations in the binding remain bound.
Textboxes that do have datarelations in the binding blank out.  I know
that datarelation and overall binding is still good because
information displayed in the debugging datagrid:

// Bind to DataGrid to see its behavior on refresh
dataGrid1.DataSource = this.objEmployeeDS;
dataGrid1.DataMember = "Employee.rlJobs";

I also check bindingmember info before and after the refresh - the
information is the same.

Does anybody have any insight or solutions to offer?  Either I am
missing something or it seems like something crucial is wrong with
databinding in .net.

Thanks,
Brian