title: how to change visible of an asp.net control of master page in content page?
body: <p>I have a <code>Master Page</code> that have a <code>asp:Panel</code> control and the code that sets <code>Visible = False</code> in it's code behind.<br>
  Now i want to change <code>Visible = True</code> in one of content page. How do it?  </p>
  
  <p>Master page code behind:</p>
  
  <pre><code>AccountUserInfo.Visible = false;  
  </code></pre>
  
  <p>Content page code behind:  </p>
  
  <pre><code>((Panel)Master.FindControl("AccountUserInfo")).Visible = true;
  </code></pre>
  
  <p>Apparently content page's code behind don't work.</p>