Why is that we need to create multiple instances of the CPTBarplot to have multiple bars at the same location?

It would be great to have support for the multidimensional array as a data source to the barPlot.

Along with this, there must be a provision to toggle between stacked and grouped flags to maintain the grouping of the bar plots and works as below:

stacked: plots will be stacked upon each other at each bar location
grouped: plots will be rendered adjacent to each other center aligned to the bar location.