Stacked BarChart issue

Hi there,
I'm having a kind of "random issue" going with my Flex app.
I've got a component with a BarChart in it, that has two stacked
series, that represent assets/debt from a bank account.
Sometimes, a Serie doesn't display, having the space reserved
for it, but not showing. The behaviour just happens from time to
time, and can't specify the circumstancies. I attach these two
links to captures of the component for a better understanding...
(two different executions of the same code).
- BarChart displayed correctly
here
- BarChart displayed wrong
here
The code is nothing strange... basically:
<mx:SeriesInterpolate id="interpol" duration="1000"/>
<mx:Stroke id="st" weight="1" color="0xEEEEEEEE"
alpha=".6" caps="square"/>
<mx:Stroke id="axis" weight="1"/>
<mx:Stroke id="callouts" weight="2" color="0x999999"
alpha=".8" caps="square"/>
<mx:HBox width="100%" horizontalScrollPolicy="auto"
verticalScrollPolicy="off" id="monthChartBox"
horizontalAlign="center" paddingTop="-15" paddingBottom="-15">
<mx:BarChart id="theChart" paddingLeft="-4" width="100%"
height="100" type="stacked" showDataTips="false"
dataProvider="{Model.getInstance().graphObject}"
mouseEnabled="false">
<mx:series>
<mx:BarSeries id="assetsSeries" xField="assets"
stroke="{st}" showDataEffect="{interpol}" width="100%">
</mx:BarSeries>
<mx:BarSeries id="debtSeries" xField="debt" stroke="{st}"
showDataEffect="{interpol}" width="100%">
</mx:BarSeries>
</mx:series>
<mx:verticalAxis>
<mx:CategoryAxis title="" id="vax"/>
</mx:verticalAxis>
<mx:horizontalAxis>
<mx:LinearAxis id="hax"
maximum="{Model.getInstance().maxGraphValue}"/>
</mx:horizontalAxis>
<mx:backgroundElements>
<mx:GridLines visible="false">
</mx:GridLines>
</mx:backgroundElements>
<mx:horizontalAxisRenderers>
<mx:AxisRenderer axis="{hax}" width="0" height="0"
visible="false" showLabels="false" axisStroke="{axis}" />
</mx:horizontalAxisRenderers>
<mx:verticalAxisRenderers>
<mx:AxisRenderer axis="{vax}" width="0" height="0"
visible="false" showLabels="false" axisStroke="{axis}"/>
</mx:verticalAxisRenderers>
</mx:BarChart>
</mx:HBox>
I'm not sure, but I've got the impression that if I remove
the interpolation show data effect I don't get the problem. Makes
sense to anyone?
thanks,
Marc

If I put it like this In WHEN-NEW-FORM-INSTANCE trigger check the PROFILE CODE and display the stacked canvas based on the value in PROFILE CODE---
Then content canvas will be shown first(Page1) ,then user will select profile code, depending upon the profile code selected ,either page2 (stacked canvas) or page3(stacked canvas) will be shown.
But I want whenever user opening the form ,page1 & page2 should show by default.then user will select profile code.if profile code is for page2 ,it should stay in that (default) page only.If profile code is for page3 then it will automatically go to page3 along with page1.

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If I put it like this In WHEN-NEW-FORM-INSTANCE trigger check the PROFILE CODE and display the stacked canvas based on the value in PROFILE CODE---
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