How to exclude series in legend (Flex)

Question

In flex charting, I want to draw something like "reference lines" which are related to specific series, therefore these lines are not independent series and should not be shown in legend. Is it possible to exclude some series from chart legend? Thanks!

Answer 1

I elaborated on Luis B's answer to make this dynamically reflect on the linechart's data provider. This way the legend only shows what fields are available in the chart. Kinda nifty.

Here is what I came up with, and it works well:

        protected function onUpdateLinechartComplete(e:FlexEvent):void 
        {

            //empty legend for fresh display
            var legendArray:Array = new Array();
            legend1.dataProvider = legendArray;

            //filter Legend data so that only LineSeries with data can be shown
            for(var i:int=0; i< linechart1.legendData.length; i++) {

                //if data is found in the line series, let's add it to the chart legend data provider, so it can be displayed in the legend
                if (linechart1.legendData[i].element.items.length != 0) {
                    legendArray.push(linechart1.legendData[i]); 
                }

            }
            legend1.dataProvider = legendArray;
            legend1.direction = "vertical";
        }



//in the page Initialize function, I add a listener event to the linechart component for when the legend update completes so it can filter lineseries on the legend's dataprovider in [onUpdateLegendComplete]
linechart1.addEventListener(FlexEvent.UPDATE_COMPLETE, onUpdateLinechartComplete);

I ended up having to use an EventHandler and attaching an event Listener to the linechart itself. This is because I was experiencing "race conditions" with the legend's data provider. Sometmes it would work, sometimes it would not. Using the event Listener eliminated that problem, and only filters the legend when the linechart has completed loading it's data.

FEEL FREE TO UPVOTE THIS ANSWER, FLEX FOLKS!!