title: Silverlight Webpart: Error occurred in deployment step 'Activate Features' because of autognerated code
body: <p>I'm developing multiple Silverlight-Webparts in a single Solution in VisualStudio 2012 for SharePoint 2010.
  Sometimes this error occurs in {Project1}:</p>
  
  <pre><code>Error occurred in deployment step 'Activate Features': 
  Failed to instantiate file "SiteAssets/{Project1Folder}/$SilverlightXapFile$" 
  from module "Designer": Source path "Features\{Project1Folder}\{otherProject}.xap" not found.
  </code></pre>
  
  <p>Elements.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;Elements xmlns="http://schemas.microsoft.com/sharepoint/" &gt;
    &lt;Module Name="{Module}" List="113" Url="_catalogs/wp"&gt;
      &lt;File Path="{Module}\{Webpart}.webpart" Url="{ProjectWebpart}.webpart" Type="GhostableInLibrary"&gt;
        &lt;Property Name="Group" Value="{Company}" /&gt;
      &lt;/File&gt;
   &lt;/Module&gt;
   &lt;Module Name="{Project}"&gt;
     &lt;File Path="{Project}\{Project1}.xap" Url="SiteAssets/{Project1Folder}/{Project1}.xap" /&gt;
     &lt;File Path="{Project}\{otherProject}.xap" Url="SiteAssets/{Project1Folder}/$SilverlightXapFile$" /&gt;
   &lt;/Module&gt;
  &lt;/Elements&gt;
  </code></pre>
  
  <p>Thanks to Subversion: I know Visual Studio added a line to Elements.xml of the {Project1} Webpart.</p>
  
  <pre><code>      &lt;File Path="{Project}\{otherProject}.xap" Url="SiteAssets/{Project1Folder}/$SilverlightXapFile$" /&gt;
  </code></pre>
  
  <p>When I delete this new line, it will work again.  </p>
  
  <p>My question:
  How do I prevent VisualStudio from adding "wrong" references in Elements.xml to other Silverlight-Projects in the same solution?</p>