Set Value of DataGridViewCom boBoxCell

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Hello-

I'm having a dickens of a time trying to set the value on a
DataGridViewCom boBoxColumn. I actually have two DataGridViewCom boBoxColumns
in my datagrid view.

First, I'm setting up the grid/column as follows..

DataGridViewCom boBoxColumn someColumn = new
DataGridViewCom boBoxColumn();
panelColumn.Dis playIndex = 0;
panelColumn.Hea derText = "SomeHeader ";
panelColumn.Dat aSource = myDataSource; // myDataSource is of
type List<MyInterest ingClass>
panelColumn.Dis playMember = "StringMemb er"; // StringMember
is of type string
panelColumn.Nam e = "Whatever";
panelColumn.Val ueMember = "InterestingVal ue"; //
InterestingValu e is a type of a custom class, i.e., MyInterestingCl ass
frm.dataGridVie w1.Columns.Add( panelColumn);
However, when I try to set the cell value, I get an exception:

DataGridViewCom boBoxCell cell =
(DataGridViewCo mboBoxCell)frm. dataGridView1["Whatever", row];
cell.Value = cell.Items[0]; // exception: Unable to
cast object of type 'MyInterestingC lass' to type 'System.String' .
call.Value = myDataSource[0]; // exception: Unable to
cast object of type 'MyInterestingC lass' to type 'System.String' .

I don't understand why it is trying to cast to System.String.. . perhaps to
display the value in the DataGridViewCom boBoxCell? This doesn't make sense,
though, because you set the .DisplayMember.

??