Hierarchical DataGrid Error

[rdeigsler]

I am building a hierarchical datagrid that has a relation between 2 tables in a dataset. When I run the app, I get the following error on the aspx page.

Compiler Error Message: CS0117: 'object' does not contain a definition for 'CreateChildView'

Below is the code for the page. Should I be using "Container.DataItem.CreateChildView("relation")" for my datasource in the nested datagrid?

									<asp:DataGrid id=dg runat="server" DataSource="<%# dsProfiles %>" DataMember="tbl_identity" DataKeyField="identity_id" AutoGenerateColumns="False" BorderColor="#E7E7FF" BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="3" GridLines="Horizontal" CellSpacing="1" Font-Names="Arial" Font-Size="9pt">

										<SelectedItemStyle Font-Bold="True" ForeColor="#F7F7F7" BackColor="#738A9C"></SelectedItemStyle>

										<AlternatingItemStyle BackColor="AliceBlue"></AlternatingItemStyle>

										<ItemStyle ForeColor="#4A3C8C" BackColor="#E7E7FF"></ItemStyle>

										<HeaderStyle Font-Size="9pt" Font-Names="Arial" Font-Bold="True" ForeColor="White" BackColor="MidnightBlue"></HeaderStyle>

										<FooterStyle ForeColor="#4A3C8C" BackColor="#B5C7DE"></FooterStyle>

										<Columns>

											<asp:TemplateColumn>

												<ItemStyle Width="9px"></ItemStyle>

												<ItemTemplate>

													<asp:ImageButton ImageUrl="../images/icon-plus.gif" CommandName="Expand" ID="btnExpand" Runat="server"></asp:ImageButton>

												</ItemTemplate>

											</asp:TemplateColumn>

											<asp:BoundColumn DataField="fname" SortExpression="fname" HeaderText="First"></asp:BoundColumn>

											<asp:BoundColumn DataField="lname" SortExpression="lname" HeaderText="Last"></asp:BoundColumn>

											<asp:BoundColumn DataField="email" SortExpression="email" HeaderText="Email"></asp:BoundColumn>

											<asp:BoundColumn DataField="dateadded" SortExpression="dateadded" HeaderText="Date Created"></asp:BoundColumn>

											<asp:BoundColumn DataField="timeadded" SortExpression="timeadded" HeaderText="Time"></asp:BoundColumn>

											<asp:TemplateColumn>

												<ItemStyle Width="1px"></ItemStyle>

												<ItemTemplate>

													<asp:PlaceHolder ID="ExpandedContent" Visible="False" Runat="server">

								</td>

							</tr>

							<tr>

								<td width="9">&nbsp;</td>

								<td colspan="5">

									<asp:DataGrid id="dgSub" runat="server" DataSource='<%# Container.DataItem.CreateChildView("tbl_identitytbl_authenticate") %>' DataMember="tbl_identity" DataKeyField="identity_id" Width="95%" AutoGenerateColumns="False" BorderColor="#E7E7FF"

										BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="3" GridLines="Horizontal"

										CellSpacing="1" Font-Names="Arial" Font-Size="9pt">

										<SelectedItemStyle Font-Bold="True" ForeColor="#F7F7F7" BackColor="#738A9C"></SelectedItemStyle>

										<AlternatingItemStyle BackColor="AliceBlue"></AlternatingItemStyle>

										<ItemStyle ForeColor="#4A3C8C" BackColor="#E7E7FF"></ItemStyle>

										<HeaderStyle Font-Size="9pt" Font-Names="Arial" Font-Bold="True" ForeColor="White" BackColor="MidnightBlue"></HeaderStyle>

										<FooterStyle ForeColor="#4A3C8C" BackColor="#B5C7DE"></FooterStyle>

										<Columns>

											<asp:BoundColumn DataField="uname" HeaderText="Username" />

											<asp:BoundColumn DataField="pword" HeaderText="Password" />

										</Columns>

									</asp:DataGrid>

									</asp:PlaceHolder> </ItemTemplate> </asp:TemplateColumn> </Columns> 

									</asp:DataGrid>