How to bind the contents of a usercontrol in a gridview

So I want to create a usercontrol using a DDL and use it in the edit template of a gridview. So far I have it defined like this.
<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="FundtypeSelector.ascx.vb" Inherits="netNewTIP.FundtypeSelector" %> <asp:DropDownList ID="Fundtype_DDL" runat="server" Width="80px" AppendDataBoundItems="True" DataSourceID="Fundtype_DataSource" DataTextField="FundType" DataValueField="FundType" > <asp:ListItem Text="----" Value="0" Selected="True" /> </asp:DropDownList> <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Please provide a fundtype for this entry." CssClass="validator" Text="*" ControlToValidate="Fundtype_ ...