Multiple Vertical Axis Renderers and auto scaling

Question

Hi
I have a problem which has been kicking my rear end for a while now.
I have a Linechart to which I add (programmatically in AS code) multiple PlotSeries. I let the first series be handled by the default verticalaxisrenderer (on the left side of the graph) and then the next series (if a different type of data) be rendererd by another verticalAxisrenderer (created programmtically) and added to the right side. And it "works", but the problem is this:
Say I add a series that has a range of 30-80 first. It works fine, BUT when i add a second series with a range of say 1100-1200  the second series is added fine but the first series is 'rescaled' on the axis to go from 30-80 to 0-1200! Which is obviously wrong! I have made other attempts to fix this and it always rescales the axis (sometimes rescaling the data, sometimes not) I have double checked that baseatZero is false and it is--its just the act of adding that second series which causes this redraw and rescale. What am I missing here? Atatched is code snippet and screenshots of behavior.
On Flex 3.5, btw
public function addSeriesToChart(acLocal:ArrayCollection, constellation:String, station:String, param:String):void
            var currentSeries:Array = lcGraph1.series;
            var stati:int = util.getStationName(station,currentStations);
            var stat:String = currentStationsLong[stati];
            var s:Object;
             var ls:PlotSeries = new PlotSeries();
            ls.displayName = y1_axis + " @ "+stat;
            ls.yField = "y1";
            ls.xField = "x1";
            ls.dataProvider = acLocal;
            seriesmin(acLocal);
            var stroke:Stroke = util.getLineStroke2(nSeries);
            ls.setStyle("stroke", stroke);
            ls.setStyle("fill",stroke.color);
            ls.setStyle("radius", 2);
            ls.setStyle("itemRenderer",new ClassFactory(CircleItemRenderer));
            s = ls;
            var renderers:Array=lcGraph1.verticalAxisRenderers;
            Application.application.export.enabled = true;
            //two cases: first series and 2+ series: must handle the default verticalAxisRenderer bug
            if (nSeries > 0)
                //if second series == first series, dont add a new renderer
                if (param != currentGraphParam(acParam1))
                      var la2:LinearAxis = new LinearAxis();
                       la2.displayName = y1_axis+" ("+util.getUnits(util.EnglishNametoCBIBSParam(param))+")";
                    la2.title = y1_axis+" ("+util.getUnits(util.EnglishNametoCBIBSParam(param))+")";
                    la2.baseAtZero = false;         
//                    la2.maximum = seriesmax(acLocal)+1;
//                    la2.minimum = seriesmin(acLocal)-1;
//                    lcGraph1.verticalAxisRenderer[0].axis.maximum = cMax;
//                    lcGraph1.verticalAxisRenderer[0].axis.minimum= cMin;
                    ar2=new AxisRenderer();
                    ar2.axis=la2;      
                    if ((nSeries % 2) == 1)
                        ar2.placement="right"
                    else
                        ar2.placement="left";
                    renderers.push(ar2);           
                     s.verticalAxis = la2;
                    lcGraph1.verticalAxisRenderers=renderers;   
                currentSeries.push(s);
                lcGraph1.verticalAxisRenderers=renderers;   
                lcGraph1.invalidateSeriesStyles();
                lcGraph1.series = currentSeries;
            else
                //create new axis
                var la2:LinearAxis = new LinearAxis();
                   la2.displayName = y1_axis+" ("+util.getUnits(util.EnglishNametoCBIBSParam(param))+")";
                la2.title = y1_axis+" ("+util.getUnits(util.EnglishNametoCBIBSParam(param))+")";
                la2.baseAtZero = false;          
                ar2=new AxisRenderer();
                //dont show it
                    ar2.visible = false;
                   ar2.placement = "left";
                   la2.maximum = seriesmax(acLocal)+1; 
                la2.minimum = seriesmin(acLocal)-1;
                cMax = la2.maximum;
                cMin = la2.minimum;
//                Alert.show(cMax);
//                Alert.show(cMin);
                ar2.axis=la2;      
                renderers.push(ar2);           
                s.verticalAxis = la2;
                currentSeries.push(s);
                lcGraph1.series = currentSeries;
                lcGraph1.verticalAxisRenderers=renderers;   
                lcGraph1.invalidateSeriesStyles();
                lcGraph1.verticalAxis.title = y1_axis+" ("+util.getUnits(util.EnglishNametoCBIBSParam(param))+")";   
                disableDefaultVerticalRenderer();
             Application.application.arrAc.push(acLocal);
            nSeries++;                                    

Answer 1

Adobe Flex LiveDocs seemed to indicate "Using multiple series in the same chart works best when the data points are in a similar range (such as a stock price and its moving average). When the data points are in numerically very different ranges, the chart can be difficult to understand because the data is shown on a single axis. The solution to this problem is to use multiple axes, each with its own range. You can plot each data series on its own axis within the same chart using the techniques described in Using multiple axes" and that link is here:
http://livedocs.adobe.com/flex/3/html/help.html?content=charts_types_11.html
I was going to tae a look at this myself, but the code posted here is quite complex, and I suspect incomplete.
If you refer to that link and still cannot solve the issue, I would try your best to boil down your code to a more simple example still exhibiting the issue, and then post that, along with any data and the simplified main app.
If this post answers your question or helps, please mark it as such.
Greg Lafrance - Flex 2 and 3 ACE certified
www.ChikaraDev.com
Flex / AIR Development, Training, and Support Services