On Jan 4, 2013, at 11:52 AM, Jerry Krinock <je...@ieee.org> wrote:

> Instead of getting a focus ring around the clicked cell, you get a 1-pixel 
> gray rectangle.
> Instead of the text being highlighted normally, you get a gray highlight.
> When you type characters,  a sysbeep.

This isn’t a bug, if I understand the issue correctly. An NSWindow without a 
title-bar returns NO from -canBecomeKeyWindow, so the window won’t accept 
keyboard focus. That’s why the highlight is gray and you can’t type into it.

To work around this, subclass NSWindow and override -canBecomeKeyWindow to 
return YES.
Or if you’re using the window for a sheet, just set the title-bar checkbox. It 
won’t make any visual change at runtime (title bars are always suppressed in 
sheets) but it will enable key focus.

—Jens
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