<DataSource	ID="DrawSector" inheritsFrom="DrawItem" Constructor="DrawSector" >
    <fields>
        <field name="centerPoint" type="Point" title="Center Point"/>
        <field name="startAngle" type="float" title="Start Angle" defaultValue="0.0"/>
        <field name="endAngle" type="float" title="End Angle" defaultValue="20.0"/>
        <field name="radius" type="integer" title="Radius" defaultValue="100"/>
    </fields>
</DataSource>
