I have a Cartesian chart containing two ColumnSeries in two ColumnSets, 
like this:

        <mx:series>
                <mx:ColumnSet columnWidthRatio=".375" offset="-.21" 
type="stacked">
                    <mx:ColumnSeries alpha=".6" yField="costs" />
                    <mx:ColumnSeries alpha=".6" yField="oneTime"/>
                </mx:ColumnSet>
               
                <mx:ColumnSet columnWidthRatio=".375" offset="0.21" 
type="stacked">
                    <mx:ColumnSeries yField="revenue" />
                    <mx:ColumnSeries yField="overhead" />
                </mx:ColumnSet>
        </mx:series>

My problem is that data interpolation doesn't seem to work in this context.

I set up an interpolation like this:

    <mx:SeriesInterpolate id="moveData"
                    duration="500"
                    minimumElementDuration="200"
                    elementOffset="0"/>

But when I try to call it either from the individual ColumnSeries or the 
ColumnSets, using:

showDataEffect="moveData"

I get an error message: "Cannot access a property or method of a null 
object reference."

Can anyone spot the problem - or is this not possible in this setup?

- Tom




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