[FLEX-28982] DropDownController - Null Object Reference

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 4.6 (Release)
• Fix Version/s: Adobe Flex SDK Next
• Component/s: Spark: DropDownList
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Carol Frampton
• Reporter: Adobe JIRA
• Created: 04/Dec/11 18:11
• Updated: 16/Oct/12 20:21
• Resolved: 16/Oct/12 20:21

Description

Steps to reproduce:
1. Apply a skin to DropDownListBase-based components (ComboBox, DropDownList, etc).
2. Invoke the detachSkin() somehow (i.e. change the skin at runtime).

Actual Results:

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 sungard.ebs.base.components::DropDownMenu/commitProperties()[C:\EBS3\Flexspace46\AmbitBaseSpark\src\sungard\ebs\base\components\DropDownMenu.as:188]
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]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()

Expected Results:

No runtime error.

Workaround (if any):

None. Monkey-patch...