chart problem: set type="stacked"

[lightrain]

I wrote a cfc to return an array to flex.
the content is :
<cfset obj=StructNew()>
<cfset obj["name"] = "1">
<cfset obj["o1"] = "500">
<cfset obj["o2"] = "400">
<cfset obj["o3"] = "300">
<cfset arr[1]=#obj#>
the flex file receive the array sent from cfc and can be shown on datagrid
correctly

then i want to create a column chart with stacked type like:

<mx:ColumnChart id="columnchart1" dataProvider="{ChartSeries2}"
type="stacked">
<mx:horizontalAxis>
<mx:CategoryAxis dataProvider="{ChartSeries2}" categoryField="name"/>
</mx:horizontalAxis>
<mx:series>
<mx:Array>
<mx:ColumnSeries yField="o1" />
<mx:ColumnSeries yField="o2" />
<mx:ColumnSeries yField="o3" />
</mx:Array>
</mx:series>
</mx:ColumnChart>

the problem is that stacked type doesn`t work correctly and three column
series overlap.
the value of the bar become 500400300

is it a bug of chart?

[lightrain]

Today I tried another way.
I sent a query from cfc to flex by AMF
The data can be displayed on the datagrid correctly.
[url]http://140.112.107.133/lightrain/chart2.gif[/url]
Nothing is shown on the chart.
Could someone help me??

lightrain