title: Grid is not supported in a Windows Presentation Foundation (WPF) project
body: <p>I am learning how to create a <code>Class Library (Windows Store apps)</code> and used a <code>UserControl</code> template to add a user control to it.</p>
  <p>Then I added a <code>Grid</code> tag to accompanying XAML. However, the tag is underlined with blue squiggles and when I hover over the tag there is</p>
  <blockquote>
  <p>Grid is not supported in a Windows Presentation Foundation (WPF) project</p>
  </blockquote>
  <p>tooltip shows up.</p>
  <p>The library seems to build without errors. I've added the library to an application and use the control in its code. The application is also builds just fine. However, when I run the application I get <code>XamlParseException</code> exception.</p>
  <p>I am using Visual Studio 2012 RTM. Both the library and the application reference only two standard assemblies (<code>.NET for Windows Store apps</code> and <code>Windows</code>).</p>
  <p>What I might done wrong and how should I fix the library?</p>