title: Warning when starting Mac Application with imagewell
body: <p>Since I upgrade my Xcode I get the following warning, when starting my programmed Application: </p>
  
  <blockquote>
    <p>2013-07-03 18:19:03.913 RMC Cone[1414:303] It does not make sense to draw an image when [NSGraphicsContext currentContext] is nil.  This is a programming error. Break on void _NSWarnForDrawingImageWithNoCurrentContext() to debug.  This will be logged only once.  This may break in the future.</p>
  </blockquote>
  
  <p>But the NSImageView has a image set. So I don't think, that that problem comes from the NSImageView. </p>
  
  <p>Is there a way to find out, which element causes this problem ?</p>