spark.components.Alert#partRemoved() implementation makes wrong super.partAdded() call

partRemoved implementation for spark.components.Alert probably has wrong super method call: partAdded instead of partRemoved.

override protected function partRemoved(partName:String, instance:Object):void {
    super.partAdded(partName, instance);
    if (partName == "buttonGroup") {
        destroyButtons(Group(instance));
    }
}

This implementation causes an exception if you change component's skin at runtime (see the attachment):

[Fault] exception, information=ReferenceError: Error #1069: Property autoLayout not found on Number and there is no default value.
at spark.components::SkinnableContainer/partAdded()[/Users/aharui/release4.13.0/frameworks/projects/spark/src/spark/components/SkinnableContainer.as:970]
at spark.components::Panel/partAdded()[/Users/aharui/release4.13.0/frameworks/projects/spark/src/spark/components/Panel.as:554]
at spark.components::Alert/partRemoved()[/Users/aharui/release4.13.0/frameworks/projects/experimental/src/spark/components/Alert.as:643]
at spark.components.supportClasses::SkinnableComponent/clearSkinParts()[/Users/aharui/release4.13.0/frameworks/projects/spark/src/spark/components/supportClasses/SkinnableComponent.as:779]
at spark.components.supportClasses::SkinnableComponent/detachSkin()[/Users/aharui/release4.13.0/frameworks/projects/spark/src/spark/components/supportClasses/SkinnableComponent.as:813]
at spark.components.supportClasses::SkinnableComponent/validateSkinChange()[/Users/aharui/release4.13.0/frameworks/projects/spark/src/spark/components/supportClasses/SkinnableComponent.as:453]
at spark.components.supportClasses::SkinnableComponent/commitProperties()[/Users/aharui/release4.13.0/frameworks/projects/spark/src/spark/components/supportClasses/SkinnableComponent.as:472]
at mx.core::UIComponent/validateProperties()[/Users/aharui/release4.13.0/frameworks/projects/framework/src/mx/core/UIComponent.as:8751]
at mx.managers::LayoutManager/validateProperties()[/Users/aharui/release4.13.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:605]
at mx.managers::LayoutManager/doPhasedInstantiation()[/Users/aharui/release4.13.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:821]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/aharui/release4.13.0/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1188]