LineChart Flex, dataProvider com uma posição o gráfico não apresenta nada, somente mais posição

<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300"
									 preinitialize="init();"
									 backgroundColor="white">  
		
		<mx:Script>
			<![CDATA[
				import mx.charts.chartClasses.IAxis;
				import mx.formatters.CurrencyFormatter;
				
				private var currFormatter:CurrencyFormatter;
				
				private function init():void {
					currFormatter = new CurrencyFormatter();
					currFormatter.precision = 2;
				}
				
				private function linearAxis_labelFunc(item:Object, prevValue:Object, axis:IAxis):String {
					return currFormatter.format(item);
				}
				
				private function lineChart_creationComplete():void {
					var linearAxisMinimum:int = Math.floor(linearAxis.computedMinimum);
					var linearAxisMaximum:int = Math.ceil(linearAxis.computedMaximum);
					linearAxis.minimum = linearAxisMinimum;
					linearAxis.maximum = linearAxisMaximum;
				}
			]]>
		</mx:Script>
		
		<mx:XMLListCollection id="dp">
			<mx:source>
				<mx:XMLList>
					<quote date="8/27/2007" open="40.38" close="40.81" />

				</mx:XMLList>
			</mx:source>
		</mx:XMLListCollection>
		
		<mx:ApplicationControlBar dock="true">
			<mx:Form styleName="plain">
				<mx:FormItem label="minimum:">
					<mx:HSlider id="minSlider"
								minimum="28"
								maximum="38"
								value="38"
								liveDragging="true"
								snapInterval="1"
								change="linearAxis.minimum = event.value;" />
				</mx:FormItem>
				<mx:FormItem label="maximum:">
					<mx:HSlider id="maxSlider"
								minimum="42"
								maximum="52"
								value="42"
								liveDragging="true"
								snapInterval="1"
								change="linearAxis.maximum = event.value;" />
				</mx:FormItem>
			</mx:Form>
			
			<mx:Spacer width="100%" />
			
			<mx:Legend dataProvider="{lineChart}"
					   direction="horizontal" />
		</mx:ApplicationControlBar>
		
		<mx:LineChart id="lineChart"
					  showDataTips="true"
					  dataProvider="{dp}"
					  width="100%"
					  height="100%"
					  creationComplete="lineChart_creationComplete();">
			
			<mx:backgroundElements>
				<mx:GridLines id="gridLines"
							  direction="both"
							  verticalTickAligned="false">
					<mx:verticalStroke>
						<mx:Stroke color="haloSilver"
								   weight="0"
								   alpha="1.0" />
					</mx:verticalStroke>
					<mx:horizontalStroke>
						<!-- Set alpha to 0 so stroke isn't visible. -->
						<mx:Stroke color="white"
								   weight="0"
								   alpha="0.0" />
					</mx:horizontalStroke>
					<mx:horizontalFill>
						<mx:SolidColor color="haloSilver"
									   alpha="0.1" />
					</mx:horizontalFill>
				</mx:GridLines>
			</mx:backgroundElements>
			
			<!-- vertical axis -->
			<mx:verticalAxis>
				<mx:LinearAxis id="linearAxis"
							   baseAtZero="false"
							   title="Price (USD)"
							   minorInterval="0.10"
							   interval="0.5"
							   labelFunction="linearAxis_labelFunc" />
			</mx:verticalAxis>
			
			<!-- horizontal axis -->
			<mx:horizontalAxis>
				<mx:CategoryAxis id="ca"
								 categoryField="@date"
								 title="Date" />
			</mx:horizontalAxis>
			
			<!-- horizontal axis renderer -->
			<mx:horizontalAxisRenderers>
				<mx:AxisRenderer axis="{ca}"
								 canDropLabels="true" />
			</mx:horizontalAxisRenderers>
			
			<!-- series -->
			<mx:series>
				<mx:LineSeries yField="@open"
							   displayName="Open" >
					<mx:itemRenderer>
						<mx:Component>
							<mx:CircleItemRenderer height="10" width="20"/>
						</mx:Component>
					</mx:itemRenderer>
					</mx:LineSeries>
			</mx:series>
		</mx:LineChart>
</mx:Canvas>