For your scenario I would recommend using two RadCartesianCharts stacked on top of each other. By ensuring that they have the same width and that their horizontal axes have the same items, you should get them aligned.
Another option is to use one RadCartesianChart with two BarSeries, where BarSeries uses different axes.
The drawback of this approach is that you will need to manually set the Maximum and/or Minimum properties of the Vertical axes in order to ensure that the two series would not overlap.
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