Problem With DataList - EditItemTemplate

I'm not able to find controls in an EditItemTemplate. I have a datalist which is bound on Not IsPostBack, and it has an item template simply displaying a list of vendors. When i click on the Edit LinkButton, my EditItemTemplate is loaded with a form to change info about that vendor. I load the form fine and can populate the fields how i want to. however i also want to have checkboxes (only one here for simplicity) which show hidden parts of the form that update more advanced portions.

Here is my Datalist definition:

<asp:DataList id="dtlLinks" runat="server" OnEditCommand="dtlLinks_EditCommand" OnUpdateCommand="dtlLinks_UpdateCommand" OnCancelCommand="dtlLinks_CancelCommand" OnDeleteCommand="dtlLinks_DeleteCommand" DataKeyField="VendorID">

<ItemTemplate>
   <asp:LinkButton Text="Edit" CommandName="edit" runat="server" ID="lnkEdit" NAME="lnkEdit" /> -
   <%# Container.DataItem("VendorName") %>
</ItemTemplate>
                                                                        

<EditItemTemplate>
   <asp:CheckBox id="chkChangeLinkImage" runat="server" Text="Change?" AutoPostBack="True"      

OnCheckedChanged="ShowHidePanel" />
   <asp:Panel id="pnlNewLinkImage" runat="server" Visible="False">
        <asp:TextBox id="txtInPanel" runat="server" Text="You Made It!" />
   </asp:Panel>
   <asp:LinkButton id="lnkUpdate" Text="Update" CommandName="update" runat="server" />
   <asp:LinkButton id="lnkCancel" Text="Cancel" CommandName="cancel" runat="server" />
   <asp:LinkButton id="lnkDelete" Text="Delete" CommandName="delete" runat="server" />
</EditItemTemplate>
</asp:DataList>

Now what i want to happen is when chkChangeLinkImage is checked, i want to show the hidden panel. My Code behind (selections) looks like:

===
Page_Load
===
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Me.PageTitle = "SamplePage.aspx"
    If Not IsPostBack Then
        BindList()
    End If
End Sub
===

===
Sub dtLinks_EditCommand
===
Sub dtlLinks_EditCommand(ByVal s As Object, ByVal e As DataListCommandEventArgs) Handles dtlLinks.EditCommand
     dtlLinks.EditItemIndex = e.Item.ItemIndex
     BindList()
End Sub
===

===
Sub ShowHidePanel - Called when checkbox is checked
===
Sub showHidePanel(ByVal s As Object, ByVal e As System.EventArgs) Handles chkChageLinkImage.CheckedChanged
        Dim pnl As Panel
        Dim chk As CheckBox

        Try
            chk = CType(FindControl("chkChangeLinkImage"), CheckBox)
            pnl = CType(FindControl("pnlNewLinkImage"), Panel)
            Response.Write("ctype ID = " & CType(FindControl("pnlNewLinkImage"), Panel).ID)
        Catch exp As NullReferenceException
            Response.Write("it messed up: e = " & exp.Message)
        End Try
End Sub
===



I can't find controls. I always get thrown into the NullReferenceException. How/Where Do i find these controls so i can make this work?? Leave any questions that you may need about my code or just ask for other parts as i will be checking this very frequently

Thank you