different datasets for bar and line chart in the same visual

I would like a bar-volume chart behind my line sparkline.  Right now it looks like i pass in data to the parent Sparklines component and that information is then passed down to SparklinesLine and SparklinesBar.  

Looking through the documentation and library I can't seem to find how I would give each of these children a different dataset.  I'm sure I'm overlooking something..

