Sounds like you were not using textured rounded buttons, which are the ones 
that I wrote about.



> On Oct 18, 2016, at 1:00 PM, Quincey Morris 
> <quinceymor...@rivergatesoftware.com> wrote:
> 
> On Oct 18, 2016, at 12:17 , Alan Snyder <applemail832...@cbfiddle.com 
> <mailto:applemail832...@cbfiddle.com>> wrote:
>> 
>> The implication is that AppKit is probing the application at unspecified 
>> times with a fake event?
> 
> Well, I had to try it in a test project. I don’t see *any* difference in 
> appearance in the buttons, with acceptsFirstResponder YES or NO, regardless 
> of window state, regardless of IB canvas or running application, *except* 
> that colored highlights (the blue indicating a default button, or the blue 
> menu indicator on a popup button) change to gray in an inactive window.
> 
> This is with macOS Sierra. It’s possible that earlier iterations of the OS X 
> UI did have an inactive appearance for buttons, and my feeble recollection is 
> that this was so for a while in the 10.6-10.8 era, at least.
> 
> Perhaps what I did at the time was disable the button when the window went 
> inactive.
> 
>> Nothing in the documentation of acceptsFirstMouse suggests such a thing.
> 
> Well, the event parameter is allowed to be nil (and AppKit headers have been 
> audited for nullability, so it’s not likely to be an oversight).
> 

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