Flex中通过DateField等接收年月日时分秒的输入

使用DateField接收年月日，NumericStepper接收时分秒，具体实现：
???? <mx:Grid width="100%" >
????? <mx:GridRow>
?????? <mx:GridItem horizontalAlign="left">
??????? <mx:DateField id="upTime" selectedDate="{new Date()}" formatString="YYYY-MM-DD" enabled="true" showToday="true" textAlign="center" yearNavigationEnabled="true"/>
??????? <mx:NumericStepper id="upHour" maxChars="2" minimum="0" maximum="23" stepSize="1" textAlign="center" width="40"/>
??????? <mx:Label text="时" textAlign="center" width="15"/>
??????? <mx:NumericStepper id="upMinute" maxChars="2" minimum="0" maximum="59" stepSize="1" textAlign="center" width="40"/>
??????? <mx:Label text="分" textAlign="right" width="15"/>
??????? <mx:NumericStepper id="upSecond" maxChars="2" minimum="0" maximum="59" stepSize="1" textAlign="center" width="40"/>
??????? <mx:Label text="秒" textAlign="center" width="15"/>
?????? </mx:GridItem>
????? </mx:GridRow>
???? </mx:Grid>

通过selectedDate="{new Date()}"，让DateField一开始按照格式formatString="YYYY-MM-DD"显示当前时间，而text="{newDate()}"虽然也能显示当前时间，但不能显示设定的格式……

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