Strange behaviour on cells

[Benhur Stein]

Hi!

While trying to understand the implementation of NSMatrix, I came to
some behaviour of NSCell and NSButtonCell that seems to be wrong.
Can anybody with more knowledge (or access to OS or OSX) verify this?

- A radio button shows its state by using an alternate image (the one
  where it is selected) when it is in the ON state. It uses the same
  image to show when it is highlighted, even if it's state is OFF.
  The problem is, when it is both highlighted and ON, it shown it's
  normal image (the one where it is not selected), and that seems
  plain wrong to me.
- At the end of the tracking of the mouse, if the button went up
  within the cell, NSCell changes its state (calling setNextState)
  before sending the action. Shouldn't this be the responsibility of
  the NSControl controlling it? (or at least of a subclass implementing
  stopTracking:at:inView:mouseIsUp:, as is the example of apple's
  documentation in

http://developer.apple.com/techpubs/macosx/Cocoa/Reference/ApplicationKit/ObjC_classic/Classes/NSCell.html#BBCDFCEJ

The problem with changing the second behaviour is that probably some 
things will stop working. I'm changing the code to track the mouse in 
NSMatrix, and it relies on this behaviour. I'll simplify it and make
it work with both behaviours, but it could be further simplified if
cells behaved differently.

Benhur