title: The "visible area" of a control?
body: <p>I have a Canvas within a ScrollViewer. The Canvas have a size of 600x600 and the ScrollViewer
  400x400. If i scroll to the right side, i can't see 200pxl left side of the Canvas. Therefore my area of Canvas begins at x=200 but actually the visible area at x=0. Is there any way to get so "visile area" of a control by a property or something like that ?</p>
  
  <p>Regards
  Gepro</p>