Chin scratcher in SAP BusinessObjects Mobile

Here's an interesting one.

Transient

What is the point of the slider control at the bottom of this chart? This type of control is only useful for time series or similar arrangements, but one would almost always use a line-, not a bar-chart, to display this type of information. Yet it appears to be the default configuration for bar charts in SAP BusinessObjects Mobile and it is used as seen above in the demo application that SAP provides.

I'm stumped.