popupcontrolextender inside gridview itemTemplate

Hello,

I am trying to get a textbox ("txtnotes") to popup under a control that I click on that's in a gridview itemtemplate.

The popup works for the first two rows oddly enough, then doesn't show up for any of the others..

<ItemTemplate><asp:HyperLink ID="hlshownotes" runat="server"><i class="fa-tags"></i></asp:HyperLink> <asp:Label ID="Label1" runat="server" CssClass="h4" Text='<%# Bind("drug") %>'></asp:Label><asp:HiddenField ID="hfdrugid" runat="server" Value='<%# Eval("drug_id") %>' /><asp:PopupControlExtender ID="pcenotes" runat="server" PopupControlID="txtnotes" TargetControlID="hlshownotes" Position="Bottom"></asp:PopupControlExtender><asp:Label ID="Label2" runat="server" Text='<%# Eval("drug_description", "{0}") %>'></asp:Label><asp:TextBox ID="txtnotes" runat="server" style="display:none;font-size:9pt;" TextMode="MultiLine" MaxLength="256"></asp:TextBox><asp:TextBoxWatermarkExtender ID="txtnotes_TextBoxWatermarkExtender" 
                                    runat="server" BehaviorID="txtnotes_TextBoxWatermarkExtender" 
                                    TargetControlID="txtnotes" WatermarkText="Add Note" /></ItemTemplate>

I have searched the interwebs to find old articles that worked with older versions of ACT... 

Can anyone help me with getting the ajax popupcontrolextender to work?

Thanks in advance