Flex Type Coercion,我认为这是精神上的

public class WindowEvent extends Event
{
    public static const WARNEVENT:String = "warnEvent";
    public static const TASKREQEVENT:String = "taskRequestEvent";
    public static const TASKANNOUNCE:String = "taskAnnounce";
    public static const WINDOWCHANGE:String = "windowChange";
    public static const ILLEGALPOSITION:String = "illegalPosition";

    // insert brevity   
}

前四个事件工作正常,但我只是添加了ILLEGALPOSITION并尝试了这个：

// inside Window.as
    private function checkDimensions():void {
       if(!Window._legalBoundaryEnable)
           return;
...    var pass:Boolean = Window.legalBoundary.containsRect(
455        this.getBounds(stage));
456    if(!pass) {
457        this.dispatchEvent(new WindowEvent(WindowEvent.ILLEGALPOSITION,...           "Illegal Position etc."));
       }
    }

所以当我点击调度方法时,Flex会向我发出这个堆栈：

TypeError: Error #1034: Type Coercion failed: cannot convert ?
        flex.utils.ui::WindowEvent@511dce41 to flash.events.MouseEvent.
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent() ?
        [C:autobuild~UIComponent.as:9298]
    at flex.utils.ui::Window/checkDimensions()[C:Users~Window.as:457]
    at flex.utils.ui::Window/stageResized()[C:Users~Window.as:220]

从跟踪中可以看出,Window.as：457是最后一个用户代码行.那么WTF是flash.events.EventDispatcher.dispatchEventFunction尝试使用MouseEvent吗？