I have exactly the same problem.
The issue is that I need to render a 3D stacked column and a line on the same chart.
Ideally, I'd like to use the same Y Axis, but there's no chart that renders a stacked column and a line on a single Y axis.
As such - StackedColumn3DLineDY.swf and MSStackedColumn2DLineDY.swf appear to be my only options. They both have Dual Y axis & I can't work out how to sync them, either.