title: Determing if an NSOpenGLView has a valid context (Cocoa OSX)
body: <p>I am trying to check that my NSOpenGLView has a valid context but it seems that a call to openGLContext will not help me figure this out.  openGLContext seems to always returns a an NsOpenGlContext (it returns the current context if the view has one and if not it makes a context and returns that).  Is there another method I could use instead?  </p>