title: Adding existing user control to WPF project
body: <p>When I add an existing user control to a project, I go to "Add existing item" and then choose both the .xaml and the .xaml.cs files for the user control.</p>
  
  <p>After adding, the .cs file seems to be dissociated from the .xaml file, although everything builds properly.</p>
  
  <p>Is there a better way to add existing user controls, since the user control actually consists of two files (the .xaml view and the .xaml.cs code behind)?</p>