Mega Code Archive
Set the size of the bubbles to be relative to each other in the different series
import mx.collections.ArrayCollection;
[Bindable]
private var s1:ArrayCollection = new ArrayCollection( [
{"x": 20, "y": 10, "r":10 },
{"x": 40, "y": 5, "r":20 } ,
{"x": 60, "y": 0, "r":30 }]);
[Bindable]
private var s2:ArrayCollection = new ArrayCollection( [
{"x": 20, "y": 50, "r":2 },
{"x": 40, "y": 75, "r":4 },
{"x": 60, "y": 100, "r":8 } ]);