title: Contents nested master page did not show
body: <p>I'm using umbraco CMS version 4.11.3
  Content nested master pages did not load(or show).
  (content header template did not show.)
  please help me.</p>
  
  <p><img src="https://i.stack.imgur.com/XxhE1.jpg" alt="My Template structure">
  Master.master code:</p>
  
  <pre><code>&lt;%@ Master Language="C#" MasterPageFile="~/umbraco/masterpages/default.master" AutoEventWireup="true" %&gt;
  
  &lt;asp:Content ContentPlaceHolderID="ContentPlaceHolderDefault" runat="server"&gt;
      &lt;!doctype html&gt;
      &lt;html&gt;
      &lt;head title="Movafaqiyat" runat="server"&gt;
  
      &lt;/head&gt;
      &lt;body&gt;
          &lt;form id="form1" runat="server"&gt;
              &lt;div id="MasterMaster" style="width: 100%;"&gt;
                  &lt;div style="width: 100%;"&gt;
                      &lt;asp:ContentPlaceHolder ID="HeaderParentContent" runat="server"&gt;
                      &lt;/asp:ContentPlaceHolder&gt;
                  &lt;/div&gt;
                  &lt;div style="width: 100%;"&gt;
                      &lt;asp:ContentPlaceHolder ID="MenuContent" runat="server"&gt;
                      &lt;/asp:ContentPlaceHolder&gt;
                  &lt;/div&gt;
                  &lt;div style="width: 100%;"&gt;
                      &lt;asp:ContentPlaceHolder ID="FooterParentContent" runat="server"&gt;
                      &lt;/asp:ContentPlaceHolder&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/form&gt;
      &lt;/body&gt;
      &lt;/html&gt;
  &lt;/asp:Content&gt;
  </code></pre>
  
  <blockquote>
    <p>Blockquote
        HeaderParent.master code:</p>
  </blockquote>
  
  <pre><code>&lt;%@ Master Language="C#" MasterPageFile="~/masterpages/Master.master" AutoEventWireup="true" %&gt;
  
  &lt;asp:Content ContentPlaceHolderID="HeaderParentContent" runat="server"&gt;
      &lt;div id="HeaderParentMaster" style="width: 100%; border: 1px solid red;"&gt;
          &lt;div&gt;
              &lt;asp:ContentPlaceHolder ID="HeaderContent" runat="server"&gt;
              &lt;/asp:ContentPlaceHolder&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/asp:Content&gt;
  </code></pre>
  
  <blockquote>
    <p>Blockquote
        Header.master code:</p>
  </blockquote>
  
  <pre><code>&lt;%@ Master Language="C#" MasterPageFile="~/masterpages/HeaderParent.master" AutoEventWireup="true" %&gt;
      &lt;asp:Content ContentPlaceHolderID="HeaderContent" runat="server"&gt;
          &lt;div style="width: 100%"&gt;
              Did not show HEADER.Master IN HERE!    
          &lt;/div&gt;
      &lt;/asp:Content&gt;
  </code></pre>