In 1.0 RC2
Go to calendar from menu in administration center, second tab should have 'active' background
(http://i.imgur.com/oiQpoNp.png)
When you click on tab 'Calendar Settings' it will have colors for 'active' tab.
Confirmed: if you click on "calendar", the "manage holiday" entry is set to active, but the settings page is presented.
Tracked at: https://github.com/elkarte/Elkarte/issues/1801