Column chart having bars with line

I am am able to successfully draw a column chart using visualization.
However I want to draw a line on the same chart. To put a an example,
the line would show the total projected cost and the bars would show
the actual cost incurred. So the line may not go from the top of bar
and will have its own data point.

Any pointers would be helpful. I am even open for writing a customized
component.

thanks in advance

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