Hello Umbraco Colleagues,
I'm trying to create a custom section by following Tim's example on umbraco.tv.
Everything works except the editCorporateCompliance.aspx page.
None of the controls with the "umb" prefix are recognized - thus it will not compile.
I'm using Umbraco 4.7.0.

Here is my code:

<%@ Page Language="C#" MasterPageFile="/umbraco/masterpages/umbracoPage.Master" AutoEventWireup="true" CodeBehind="editCorporateCompliance.aspx.cs" Inherits="CustomTree.editCorporateCompliance" %>
<%@ Register TagPrefix="umb" Namespace="umbraco.uicontrols" Assembly="controls" %>

<asp:Content ID="Content" ContentPlaceHolderID="body" runat="server">
    <umb:UmbracoPanel ID="Panel1" runat="server" hasMenu="true" Text="Edit Corporate Compliance">
            <umb:Pane ID="Pane1" runat="server">
        
            <umb:PropertyPanel ID="PPanel1" runat="server" Text="Wrong word">
                <asp:TextBox ID="txtWrongWord" runat="server" MaxLength="150" 
                CssClass="guiInputText guiInputStandardSize"></asp:TextBox>
            </umb:PropertyPanel>
            
            <umb:PropertyPanel ID="PPanel2" runat="server" Text="Correct word">
                <asp:TextBox ID="txtCorrectWord" runat="server" MaxLength="150" 
                CssClass="guiInputText guiInputStandardSize"></asp:TextBox>
            </umb:PropertyPanel>
            
            <umb:PropertyPanel ID="PPanel3" runat="server" Text="Cause">
                <asp:TextBox ID="txtCause" runat="server" TextMode="MultiLine" 
                CssClass="guiInputText guiInputStandardSize"></asp:TextBox>
            </umb:PropertyPanel>
        </umb:Pane>
    </umb:UmbracoPanel>
</asp:Content>

I saw one post on Stack Overflow that suggested adding a reference to ClientDependency.Core but that didn't help.

I can't see what I'm doing wrong.
If anyone has gotten this to work, could you help me out and/or post the solution?

Thanks,

David