[Action Script] Creating Charts with Step Functions June,2012

Hi, I am trying to create a chart with an x-axis of days that has two series, a column and line series. The column series will have a bar for each day and I want the line series to be constant across a group of 7 days and then jump to a different level, where it will remain constant for another 7 days (i.e. create a step function). I am using an ArrayCollection object for the data so I currently have something like this:

Code: <fx:Script>
    <![CDATA[
         
          import mx.collections.ArrayCollection;

          [Bindable]
          private var levels:ArrayCollection = new ArrayCollection([
                      {DaysLeft: 14, Daily: 8, WeeklyAvg: 12.86},
                      {DaysLeft: 13, Daily: 10, WeeklyAvg: 12.86},
                      {DaysLeft: 12, Daily: 9, WeeklyAvg: 12.86},
                      {DaysLeft: 11, Daily: 14, WeeklyAvg: 12.86},
                      {DaysLeft: 10, Daily: 12, WeeklyAvg: 12.86},
                      {DaysLeft: 9, Daily: 18, WeeklyAvg: 12.86},
                      {DaysLeft: 8, Daily: 19, WeeklyAvg: 12.86},
                      {DaysLeft: 7, Daily: 20, WeeklyAvg: 15.86},
                      {DaysLeft: 6, Daily: 19, WeeklyAvg: 15.86},
                      {DaysLeft: 5, Daily: 22, WeeklyAvg: 15.86},
                      {DaysLeft: 4, Daily: 14, WeeklyAvg: 15.86},
                      {DaysLeft: 3, Daily: 13, WeeklyAvg: 15.86},
                      {DaysLeft: 2, Daily: 11, WeeklyAvg: 15.86},
                      {DaysLeft: 1, Daily: 12, WeeklyAvg: 15.86},  ])

    ]]>
</fx:Script>In the chart MXML code I have the following series declared:

Code: <mx:series>

      <mx:ColumnSeries xField="DaysLeft"
                    yField="Daily"
                    displayName="Days Left">
      </mx:ColumnSeries>

      <mx:LineSeries xField="DaysLeft"
                          yField="WeeklyAvg"
                displayName="Weekly Out at Current Pace">
      </mx:LineSeries>

</mx:series>This of course gives a straight line that changes values from 12.86 to 15.86 from day 7 to day 8. How could I make this line change values between day 7 and day 8 in the form of a step function?

Thank you very much for helping!
Creating Charts with Step Functions

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