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1. Re: I created a custom polygon from a shape file (a City boundary) and am trying to plot some circle points on top of it, but when I create the dual axis to plot the points the map background disappears. Any way around this?
Using the techniques I documented in Mapping polygons and points together dual axis, I created Sheet 3 in the attachment. The only issue I did not resolve is the "odd center dots" problem. The process to eliminate this is documented in the above link, and it involves creating a second polygon. But in this case, because the number of incidents is on the Size shelf for the marks, and the number of incidents is null for the center dot, it is extremely tiny, and is easily missed, so it may not be a problem in your case.
I hope that helps.