title: Loading another Page in Content Page is not Working in ASP.NET with EXT.NET
body: <p>I am working with Asp.Net 3.5 and Ext.Net 1.0.
  I had created One Master Page(Site.master) and one content page(User.aspx) in my Application and I am loading one page(UserManager.aspx) into content page </p>
  
  <p>If I put normal HTML tags into UserManager.aspx that works fine but if i put EXt.NET controls in it I wont work..</p>
  
  <p><strong>MasterPage</strong></p>
  
  <pre><code>&lt;ext:Panel ID="Panel6" runat="server" Region="Center" CollapseMode="Mini" Margins="0 0 4 4"&gt;               
       &lt;Content&gt;                 
          &lt;asp:ContentPlaceHolder ID="cntMainCenter" runat="server"&gt;                                
          &lt;/asp:ContentPlaceHolder&gt;
        &lt;/Content&gt;                                                        
    &lt;/ext:Panel&gt;
  </code></pre>
  
  <p><strong>ContentPage</strong></p>
  
  <pre><code>&lt;ext:ButtonGroup ID="ButtonGroup1" runat="server" Title="" Columns="3"&gt;
             &lt;Items&gt;
                   &lt;ext:SplitButton ID="SplitButton1" runat="server" 
                            Text="Users" IconCls="add" IconAlign="Top"
                            ArrowAlign="Bottom" Width="60" Scale="Large" RowSpan="3"&gt;  
                         &lt;Listeners&gt;
                             &lt;Click Handler="#{panel}.load('UserManager.aspx');" /&gt;
                         &lt;/Listeners&gt;            
                    &lt;/ext:SplitButton&gt;                                                                  
            &lt;/Items&gt;
   &lt;/ext:ButtonGroup&gt;
  </code></pre>
  
  <p>I am <strong>Loading UserManager.aspx Page in content on click of Content Page's Split Button</strong>.</p>
  
  <pre><code>&lt;asp:Content ID="Content2" ContentPlaceHolderID="cntMainCenter" runat="server"&gt;
  &lt;ext:Panel runat="server" ID="panel" BodyBorder="false" Border="true" Title="Panel" &gt;
  &lt;Items&gt;
  
  &lt;/Items&gt;
   &lt;/ext:Panel&gt;
  &lt;/asp:Content&gt;
  </code></pre>
  
  <p><strong>UserManager Page</strong></p>
  
  <pre><code>&lt;%@ Page Language="C#" AutoEventWireup="true" CodeBehind="test.aspx.cs" Inherits="SPA_SCHEDULER.test" %&gt; &lt;%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %&gt;
  
  &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  
  &lt;html xmlns="http://www.w3.org/1999/xhtml" &gt; &lt;head runat="server"&gt;
      &lt;title&gt;&lt;/title&gt;
       &lt;/head&gt; 
        &lt;body&gt; 
            &lt;ext:ResourceManager ID="ResourceManager1" runat="server"&gt;
            &lt;/ext:ResourceManager&gt;  
  
            &lt;ext:Panel runat="server" Title="dfdf" Height="100" Width="100"&gt; 
            &lt;/ext:Panel&gt; 
          &lt;/body&gt; 
  &lt;/html&gt;
  </code></pre>
  
  <p><strong>If I write HTML Tags instead of EXT.Panel in UserManager.aspx page it will work fine but if i write EXT.NET any control it will not loaded</strong>.</p>
  
  <p><img src="https://i.stack.imgur.com/Xc4M7.png" alt="enter image description here"></p>