Hello,
Adobe states that Charts are supported in mobile projects but when I try to change the following working files (created project with File - New - Flex Mobile Project - Google Nexus One):
MyTest.mxml:
<?xml version="1.0" encoding="utf-8"?>
<s:MobileApplication 
      xmlns:fx="http://ns.adobe.com/mxml/2009" 
      xmlns:s="library://ns.adobe.com/flex/spark" 
      firstView="views.MyTestHome">
 <s:navigationContent>
  <s:Button label="Home"
     click="navigator.popToFirstView();"/>
 </s:navigationContent>
 <s:actionContent/>
</s:MobileApplication>
MyTestHome.mxml:
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
  xmlns:s="library://ns.adobe.com/flex/spark" 
  title="Test Chart">
</s:View>
to the new MyTestHome.mxml:
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
  xmlns:mx="library://ns.adobe.com/flex/mx" 
  xmlns:s="library://ns.adobe.com/flex/spark"
  title="Test Chart">
 <fx:Script>
  <![CDATA[
   import mx.collections.*;
   [Bindable]
   private var medalsAC:ArrayCollection = 
    new ArrayCollection( [
    {Country: "USA", Gold: 35, Silver:39, Bronze: 29 },
    {Country:"China", Gold: 32, Silver:17, Bronze: 14 },
    {Country:"Russia", Gold: 27, Silver:27, Bronze: 38 } 
   ]);
  ]]>
 </fx:Script>
 <mx:PieChart id="chart" height="100%" width="100%"
     paddingRight="5" paddingLeft="5" color="0x323232"
     dataProvider="{medalsAC}" >
  <mx:series>
   <mx:PieSeries labelPosition="callout" field="Gold">
    <mx:calloutStroke>
     <s:SolidColorStroke weight="0" 
        color="0x888888" alpha="1.0"/>
    </mx:calloutStroke>
    <mx:radialStroke>
     <s:SolidColorStroke weight="0" 
        color="#FFFFFF" alpha="0.20"/>
    </mx:radialStroke>
    <mx:stroke>
     <s:SolidColorStroke color="0" 
        alpha="0.20" weight="2"/>
    </mx:stroke>
   </mx:PieSeries>
  </mx:series>
 </mx:PieChart> 
</s:View>
and also add 
c:\Program Files\Adobe\Adobe Flash
Builder Burrito\sdks\4.5.0\frameworks\libs\datavisualization.swc
c:\Program Files\Adobe\Adobe Flash Builder Burrito\sdks\4.5.0\frameworks\libs\sparkskins.swc
c:\Program Files\Adobe\Adobe Flash Builder Burrito\sdks\4.5.0\frameworks\libs\mx\mx.swc
to Flex Build Path (clicking "Add SWC" button):
Then it fails with the error:
Could not resolve  to a component implementation. 
Does anybody please have an idea here? Alex