[Mono-osx] [MonoMac] QCCompositionLayer Sample

[Miguel de Icaza]

>
> Added your suggestions.
>
> Also added NullAllowed to Filters for CALayer
>
> I seem to be having all sorts of problems with git today.  I modified the
> sources for the solution but could not get a patch/diff for it to save my
> life.  No diffs at all.  Really weird.

Applied both.  Perhaps we could add some text that tells the user to
try the keys?   Right now it is not obvious.