I would like to create a transparent  window that spans all the screens and 
that handles mouse down events.   Below is the code that I use to create my 
transparent window.  The transparent window gets created and display 
successfully.  However, mouse down events are not directed to the window.  I 
can see where this feature is desirable. For example making a round window.   
However, not in my case.

Is there a way that I can setup a transparent  window to receive mouse down 
events?

Note: I have found that if I set the window's background color alpha value to 
0.05 or greater I will receive mouse down events.   However this little amount 
of alpha causes some color shift in the background image.

- (id)init
{
        NSRect rect = [[NSScreen mainScreen] frame];
        
        // get the union of all the screens
    for (NSScreen* s in [NSScreen screens])
      {
         rect = NSUnionRect(rect,[s frame]);
      }
        
    self = [super initWithContentRect:rect styleMask:NSBorderlessWindowMask 
backing:NSBackingStoreRetained defer:YES];
 
    if (self)
      {
            [self setBackgroundColor:[NSColor clearColor]];
            [self setOpaque:NO];
      }
  
     return self;
}

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