hover feature on show usage does not work in iTunes?

when I am trying to sync my iphone 5S and Ipad mini in iTunes, on the main summary page at the bottom where the color usage bars are.... I see a total amount availabel but when I hover over the color bars, there is no info available. Nothing happens. How do I tell what how much space each of those color bars is using?

Using Itunes 11.1.4 and Mac OSX 10.9.1