This property is used to specify the style of the marker on the WindowSplitter on MacOS systems.
Possible values are:
0 = REALbasic Style
1 = Outlook Style
2 = None
3 = OS X
4 = OS X Metal
Style 3 and 4 are only available on MacOS 10.3 or later. If the End user does not have MacOS 10.3 or later then the Style defined in MacFailStyle will be used instead.
In the default theme in MacOS 10.3 then OS X and OS X Metal are the same. We recommend using the OS X Metal style for metalic windows as in future MacOS versions this may be different for Metal windows.