Hi All: Now, my project need to change the skin of the components at runtime, I used styleManager.loadStyleDeclarations(styleList.selectedItem["styleUrl"]) to change the skin. But the spark.components.supportClasses.DropDownListBase throw a error. My Adobe AIR SDK version is 3.7. Details are as follows:
TypeError: Error #1009: Cannot access a property or method of a null object reference. at spark.components.supportClasses::DropDownController/set openButton()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\DropDownController.as:100] at spark.components.supportClasses::DropDownListBase/partRemoved()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\DropDownListBase.as:543] at spark.components.supportClasses::SkinnableComponent/clearSkinParts()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:764] at spark.components.supportClasses::SkinnableComponent/detachSkin()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:798] at spark.components.supportClasses::SkinnableComponent/validateSkinChange()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:442] at spark.components.supportClasses::SkinnableComponent/commitProperties()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:457] at spark.components.supportClasses::ListBase/commitProperties()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\ListBase.as:892] at spark.components::List/commitProperties()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\List.as:1139] at spark.components.supportClasses::DropDownListBase/commitProperties()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\DropDownListBase.as:508] at spark.components::DropDownList/commitProperties()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\DropDownList.as:287] at mx.core::UIComponent/validateProperties()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8219] at mx.managers::LayoutManager/validateProperties()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:597] at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:813] at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180] moushuai00
