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I am having trouble getting my project to accept the WebDialogWindow. I have used this before and cant determine what is causing the problem.

I added the following to my .aspx page which has a Master Page and causes the error WebDialogWindow is ambiguous in the namespace 'Infragistics.Web.UI.LayoutControls'.

<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="ContractDescriptionList.aspx.vb" Inherits="ContractDescriptionList" %>

 <%@ Register Assembly="Infragistics4.Web.v13.1, Version=13.1.20131.2045, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb"

Namespace="Infragistics.Web.UI.LayoutControls" TagPrefix="ig" %>

Output error = C:\projects\Lease\ContractDescriptionList.aspx.vb(30,0): error BC30560: 'DialogWindowState' is ambiguous in the namespace 'Infragistics.Web.UI.LayoutControls'.