Tooltip is not showing on flow of data with reverse time series

First of all, thank you for this awesome library.
Here is my request. I have a use-case where I have to load a timeseries dynamically in the reverse order. It is working fine but the tooltip is showing only on the first item. Could you please help me with this one.
Please see this fiddle
http://jsfiddle.net/k9Dbf/533/