<DataSource	ID="CanvasItem" inheritsFrom="FormItem" Constructor="CanvasItem">
	<fields>
		<field name="canvas"    type="Canvas" />    
		<field name="canvasConstructor" type="string" />                
        <field name="canvasProperties" type="Canvas" propertiesOnly="true" />
        <field name="canvasDefaults" type="Canvas" propertiesOnly="true" />
     </fields>
</DataSource>
