Could not find Control in ControlParameter inside EditItemTemplate

I am working on a Dynamic Data website and I have run into a wall. I have a Details page where the details for each employee can be seen, and then I have a separate page to edit each employee. I did this because I need to use DropDownList boxes for Department and Job in each department. Nevertheless, I am having trouble accessing the department ddl and I think it is because it is inside an EditItemTemplate. Here is what I have:

<asp:DetailsView ID="dvEmployee" 
                    DataSourceID="EmpDVds" 
                    AutoGenerateRows="false" 
                    DataKeyNames="Id" 
                    GridLines="None" 
                    CellSpacing="10" 
                    runat="server" DefaultMode="Edit">
                    <Fields>
                        <asp:TemplateField HeaderStyle-Font-Bold="true" HeaderText="Department: ">
                            <EditItemTemplate>
                                <asp:DropDownList ID="ddlDept" DataSourceID="DeptDDLds" DataTextField = "DepartmentName" DataValueField = "Id" runat="server" SelectedValue='<%#Bind("DeptID") %>' />
                            </EditItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderStyle-Font-Bold="true" HeaderText="Job Code: ">
                            <EditItemTemplate>
                                <asp:DropDownList ID="ddlJob" DataSourceID="JobDDLds" DataTextField = "JobName" DataValueField = "Id" runat="server" />
                            </EditItemTemplate>
                        </asp:TemplateField>
                    </Fields>

Then I am trying to use the ddlDept SelectedValue to populate the ddlJob. Here is the DataSource I am trying to use.

<asp:SqlDataSource ID="JobDDLds"
                    SelectCommand="
                        SELECT 
                        Id,