In the case of DrawRegion we default it to plot behind the bars as the use of DrawRegion is to shade some area behind the bars and it is not a traditional selectable object as our other drawing objects are therefor it doesn't reside on the z order.
I will put in the suggestion that this z order handling be changed for DrawRegion(), for the user to complete this as it stand now they would need to use the plot override to plot the bitmap image or shade this area.
We have an example on this in our NinjaTrader platform by default under SamplePlotOverride under Control Center->Edit NinjaScript->Indicator->CustomPlotSample.
-Brett

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