ASP.NET - adding a databound dropdownlist during runtime

I have successfully added a databound dropdownlist to my site via standard design...
--------------------.aspx----------------------------------------------------------------------------------
<asp:SqlDataSource ID="sdsSelectReport" runat="server" ConnectionString="<%$connectionStrings:ConnectionString %>" DataSourceMode="DataSet"></asp:SqlDataSource>
            <asp:DropDownList ID="ddlSelectReport" runat="server" DataSourceID="sdsSelectReport" DataTextField="HierarchyDesc" DataValueField="HierarchyID" AppendDataBoundItems="true">
                <asp:ListItem Text="All Users" Value="AllUsers" Selected="true"></asp:ListItem>
            </asp:DropDownList>


However, I am trying to create the same dropdownlist in memory during runtime and add it to a table cell.  The dropdownlist shows up in the table cell, but it is not databound.  Its just an empty dropdownlist.
------------------------------------.aspx-------------------------------------------
<asp:SqlDataSource ID="sdsLevelSelection" runat="server" ConnectionString="<%$connectionStrings:ConnectionString %>" DataSourceMode="DataSet"></asp:SqlDataSource>
--------------------------------------.aspx.vb-------------------------------------------------
               rowcell = New TableCell
                ddl = New DropDownList
                ddl.ID = "ddlLevelSelect" & x.ToString()
                ddl.DataSource = "sdsLevelSelection"
                ddl.DataTextField = "HierarchyDesc"
                ddl.DataValueField = "HierarchyID"
                rowcell.Controls.Add(ddl)
                tblrow.Cells.Add(rowcell)
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