Flex时分秒控件yahoo:TimeStepper flex4.6不可用问题

spacecave 2014-09-22 10:42:29

yahoo的一个时分秒控件，<yahoo:TimeStepper>有人用过吗？flex4.0用着没问题，4.6就不行了，会报如下错误：
TypeError: Error #1009: 无法访问空对象引用的属性或方法。
at com.yahoo.astra.mx.controls.inputClasses::BaseMultiFieldInput/updateDisplayList()[C:\branches\astra1_3_1\yahoo\presentation\flash\Projects\AstraFlex\output\Source\com\yahoo\astra\mx\controls\inputClasses\BaseMultiFieldInput.as:316]
at mx.core::UIComponent/validateDisplayList()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8999]
at mx.managers::LayoutManager/validateClient()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1033]
at mx.core::UIComponent/validateNow()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8077]
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::validateBaselinePosition()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8116]
at mx.core::UIComponent/get baselinePosition()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:6550]
at mx.containers::FormItem/updateDisplayList()[E:\dev\4.y\frameworks\projects\mx\src\mx\containers\FormItem.as:840]
at mx.core::UIComponent/validateDisplayList()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8999]
at mx.core::Container/validateDisplayList()[E:\dev\4.y\frameworks\projects\mx\src\mx\core\Container.as:3298]
at mx.managers::LayoutManager/validateDisplayList()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:736]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:801]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180]

求解决办法

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