Hi there,

The item is declined due to lack of popularity of the feature request. 

If more people requests MacOS skin(s), we will update the status to Under Review again.

On a side note, you can create custom skins with the help of the Theme Builder. You can give it a spin.

Regards,
Rumen
Progress Telerik

Few things of note:

* Some things from the MacOS X appearance can be hardly emulated in web
* A MacOS X Yosemite skin will be departure from the traditional way we do skin
* There are some elements / widgets not present in OS X Yosemite
* Others are there but are limited or require specific combinations, say the tabs in OS X is always centerd and aways has the accompanying multiview area (no tabs scrolling, no multilevel tab, no vertical tabs) 
* In addition, there are at least two types of tabs e.g. one that looks like pills an the other available in the finder / safari.

Those are few that pop in my mind right away. If the item gets enough attention, we'll do a proper research and define the limits of the skin.