[Solved] Customizing a Financial Chart?

I’ve been interested in drawing shapes (e.g. a rectangle) on top of an Interactive Trading financial chart which was obtained by calling chart = InteractiveTradingChart[ arguments]
Is there any way to draw on top of the chart? Could someone provide sample code on, for instance, how to draw a line or a rectangle on top of the chart? I am particularly interested in doing so on top of the InteractiveTradingChart.

When I asked this question a while back, Wolfram sent me the attached workbook from a prior presentation.

CustomIndicator.nb (1.9 MB)

Thank you Mike.
This would be the definitive answer. I took a look at it and I might be able to understand it and make my own indicators.
Thank you very much.
I will mark your answer as the answer.

Thank you Mr. Besso! I have been looking for material associated with a talk given by Mike Kelly in 2012 at the Wolfram Technology Conference (that I can’t remember if I attended or not) on custom indicators, but I was unable to find information/example code on custom indicators anywhere else in the standard Mathematica documentation.

Nathan: You are welcome.

As I understand it, this is the notebook that Mike Kelly used in that presentation.