insert row into dataset from datagrid issues

[bopritchard]

i've got a datagrid that has a dropdownlist(populated in the datasource property) control in it...

i'm creating the dataset for the datagrid using the code below...

so when a selection is made in the dropdownlist and the update button is hit...the "id" and "name" values should be saved to the dataset and then a editable row inserted below it in the datagrid so that another dropdownlist selection can be made...

[highlight #FF99FF]QUESTION[/highlight]
On postback how do I save the data from the dropdown list to the dataset and insert blank row below the saved one...make sense?

DataSet Creation Code

DataSet dsExaminers = new DataSet();
DataTable dtExaminers = new DataTable();
DataColumn dcExaminers = new DataColumn("id");
dtExaminers.Columns.Add(dcExaminers);
dcExaminers = new DataColumn("name");
dtExaminers.Columns.Add(dcExaminers);
DataRow drExaminers = dtExaminers.NewRow();
dtExaminers.Rows.Add(drExaminers);
dsExaminers.Tables.Add(dtExaminers);
Examiners.EditItemIndex = dsExaminers.Tables[0].Rows.Count - 1;
Examiners.DataSource = dsExaminers;
Examiners.DataBind();

Datagrid Code

<asp:datagrid id="Examiners" Width="95%" Runat="server"   OnCancelCommand="ExaminersDataCancel"
OnUpdateCommand="ExaminersDataUpdate" OnEditCommand="ExaminersDataEdit" OnDeleteCommand="ExaminersDataDelete"
DataKeyField="ID" AutoGenerateColumns="False" Height="10px" OnItemDataBound="ExaminersDataBind">
					
<Columns>
<asp:TemplateColumn HeaderText="Examiners">
<ItemTemplate>
'<%# DataBinder.Eval(Container.DataItem, "Name") %>'
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList id=ExaminerList runat=server Width=80% DataValueField="ID" DataTextField="Name" DataSource='<%# CCSExamination.GetExaminers() %>' />
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn>
<ItemTemplate>
<asp:Button ID="Edit" Text="Edit" CssClass="Button" CommandName="Edit" Runat="server" Width="50" />
<asp:Button ID="Delete" Text="Delete" CssClass="Button" CommandName="Delete" Runat="server" />
</ItemTemplate>
<EditItemTemplate>
<asp:Button ID="Update" Text="Update" CssClass="button" CommandName="Update" Runat="server" />
<asp:button ID="editCancel" Text="Cancel" CssClass="button" CommandName="Cancel" Runat="server" />
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>