title: How to move borderless child-window/Dialog in WPF
body: <p>I have a MainWindow with a Border and a ChildWindow as Dialog without a Border. When a child window is open it's not possible to move the mainwindow or to resize it. </p>
  
  <p>I want the application to behave as it is only one Window. </p>
  
  <p>I have tried to use an behavior as in th following link but that is only moving my child window inside of the mainwindow.</p>
  
  <p><a href="http://wpftutorial.net/Behaviors.html" rel="nofollow">DragBahvior</a></p>