title: Merging Value Providers in GXT 3.0
body: <p>I have a grid, and ValueProviders releated to this grid. If I want to add ValueProviders to the column one by one as ColumnConfig's, then it's OK. I mean I can add the columns like Name - Surname - Adress etc.</p>
  
  <p>But now, I have a different case. I must add some fields like Name / Surname - Adress / Mail - Phone Number etc. 
  In short, I need to merge ValueProviders' values. How can I merge them? Or is it possible in another way? I'm looking for a solution from annotations. A code snippet from my properties file.</p>
  
  <pre><code>@Path("bolum.ad")
      ValueProvider&lt;Deneme, String&gt; bolumAd();
  @Path("bolum.aciklama")
      ValueProvider&lt;Deneme, String&gt; bolumAciklama();
  </code></pre>
  
  <p>I'm using GXT 3.0</p>
  
  <p>Thanks.</p>