title: Resourcemanagers resourceset has wrong values
body: <p>i'm developing a wpf / prism 4 application which uses localized resx resourcefiles. After some debugging (it didn't work as expected) i saw that all the resourceset's of my resourcemanager had the same values. The values of the default loc.resx.</p>
  
  <p><img src="https://i.stack.imgur.com/A8Y6G.jpg" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/RfhCT.png" alt="enter image description here"></p>
  
  <p>My Question is: What's going wrong there?</p>
  
  <p>Thank you in advance</p>