title: Xamarin Resource.designer.cs not generating reference for newly add file
body: <p>I am adding a file called citybase.png to my drawable folder when I set the src property of my ImageView to @drawable/citybase the image is not showing up in the design view. Inspecting the Resource.designer.cs class I realize that no reference is being generated for any files I add to the drawable folder(except for the default Icon of course).</p>
  
  <pre><code>    public partial class Drawable
      {
  
          // aapt resource value: 0x7f020000
          public const int Icon = 2130837504;
  
          static Drawable()
          {
              global::Android.Runtime.ResourceIdManager.UpdateIdValues();
          }
  
          private Drawable()
          {
          }
      }
  </code></pre>
  
  <p>I tried rebuilding and cleaning the project but that does not work. How can I fix this problem? (Xamarin Studio 4.2.3)</p>