title: Access asp:content from code behind
body: <p>Ok, I am an experienced web developer but sometimes ASP.Net is tricking me. 
  I have a master page in asp.net. Then I have a page based on that master page (home.aspx). Now in home.aspx.cs I want to access the asp:content controls to add controls programmatically. </p>
  
  <p>Aspx looks like this: </p>
  
  <pre><code>&lt;asp:Content ID="leftCol" ContentPlaceHolderID="cphLeftCol" Runat="Server"&gt;
    &lt;asp:PlaceHolder ID="phLeftCol" runat="server"&gt;
    &lt;/asp:PlaceHolder&gt;
  &lt;/asp:Content&gt;
  </code></pre>
  
  <p>I would expect that I can reference "leftCol" from my code behind. But it's unknown there. 
  For testing I added my own placeholder "phLeftCol". I can reference that without issues. </p>
  
  <p>Is there something I don't see?</p>