ObjectDataSource does not have a naming container error

Hey All,
I have done my searching and haven't found anything related to my issue. I have an aspx page that contains a regular drop down control. When the selectedIndex is changed, it fires off a post back and also rebinds a datalist based on its value. Inside the datalist I have an ascx control which has a gridview and an object datasource:
 
ASPX page:
<asp:DropDownList runat ="server" DataSourceID="odsSelections" DataTextField="Description" DataValueField="ID" AutoPostBack="true">
</asp:DropDownList>
<asp:DataList runat="server" DataSourceID="ObjectDataSource3">
             <ItemTemplate>
                 <uc2:SubControl runat ="server" SelectedID='<%# ...