I am aware of BackColor to change the chart background; however, the Y values of the Rectangle are critical -- Please make a version of DrawRectangle that uses a backColor for the fill so that it is UNDERNEATH everything else?
BTW, your DrawRectangle help says this is a back color, but it really isn't. It is a fill color, I suggest you change the name to reflect that.
Certainly, a generic solution to push to the background any drawn object would be ideal, but I expect that will take longer and I prefer not to wait for ideal...
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