title: WPF: DoDragDrop getting interrupted when clicking Right/Middle Mouse button
body: <p>I have extented Canvas {System.Windows.Controls} and items that are draggable into the Canvas.
  During dragging, I have OnDragOver event where I do panning when user clicks and holds Middle mouse button. </p>
  
  <p>On the <strong>Item</strong> site : <code>DoDragDrop</code> - common drag functionality<br>
  On the <strong>Canvas</strong> site : <code>OnDragOver</code> - panning the canvas</p>
  
  <p>So user can drag and pan at the same time.</p>
  
  <p>Everything worked fine until I moved to new laptop (Lenovo) and Visual Studio 2012 (2010 before). Now when I press middle (or right) mouse button, event OnMouseMove of the Canvas is immediately fired. After that dragging is immediately stopped and no panning as well.</p>
  
  <p>My co-worker tried to run the same code from Visual Studio 2010 and it worked OK. He made setup of his version so I tried it and the result was the same - on my laptop I cannot pan during dragging..</p>
  
  <p>Does anybody have some idea whats the problem? HW, SW, Lenovo, Windows?</p>
  
  <p>project info: WPF, DevExpress 12.1, .NET 4, Windows 7 Proffesional, VS 2012</p>
  
  <p>Pls keep in mind that Im still new in WPF :)</p>