My Skin is not found at runtime

Reproduce with FB 262635

Steps to reproduce:
1. import projects
2. run the spark-bug3 project

Actual Results:
Error: Skin for Main.ApplicationSkin2._ApplicationSkin_Group1.contentGroup.MyContainer5.MyContainerSkin6.MyComponent7 cannot be found.
at spark.components.supportClasses::SkinnableComponent/attachSkin()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:628]
at spark.components.supportClasses::SkinnableComponent/validateSkinChange()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:403]
at spark.components.supportClasses::SkinnableComponent/createChildren()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:366]
at mx.core::UIComponent/initialize()[E:\dev\trunk\frameworks\projects\framework\src\mx\core\UIComponent.as:7173]
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\trunk\frameworks\projects\framework\src\mx\core\UIComponent.as:7065]
at mx.core::UIComponent/addChildAt()[E:\dev\trunk\frameworks\projects\framework\src\mx\core\UIComponent.as:6772]
at spark.components::Group/addDisplayObjectToDisplayList()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\Group.as:1805]
at spark.components::Group/http://www.adobe.com/2006/flex/mx/internal::elementAdded()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\Group.as:1401]
at spark.components::Group/setMXMLContent()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\Group.as:502]
at spark.components::Group/createChildren()[E:\dev\trunk\frameworks\projects\spark\src\spark\components\Group.as:724]
at mx.core::UIComponent/initialize()[E:\dev\trunk\frameworks\projects\framework\src\mx\core\UIComponent.as:7173]
at bug2::MyContainerSkin/initialize()

Expected Results:
Should work

Workaround (if any):