title: Custom icon for umbraco section
body: <p>I am using Umbraco 7. I have created a custom section using </p>
  
  <pre><code>namespace MyUmbraco.Sections
  {
      [Application("CustomSection","mySection","myicon",8)]
      public class CustomSection: IApplication
      {
      }
  }
  </code></pre>
  
  <p>I am able to create nodes in my section, CRUD operations for those items. only thing in my example is, i am unable to add a custom icon for that section, if i use built in icons, it works fine. I have also added icon image to /umbraco/Images/Tray folder and css in umbracoGUI.css as</p>
  
  <pre><code>#tray .myicon{
  
      background-image:url('../Images/Tray/myicon.png');
  
  }
  </code></pre>
  
  <p>is there something I am missing?</p>