Show Scroll Over Tooltip in Area Chart

Hi all,

With a Stacked Area Chart when you scroll over the visualzation a vertical bar and tooltip automatically appear showign the breakdown of the sums of the different categories from the legend. However, when changing to a normal Area Chart no such tooltip appears. Is there a way to activate it? This is pretty essential when viewing the Area Chart visualization to understand the data at various points along the x-axis.

Thanks!