[FLEX-24709] ScrollControlBase null mask

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK 3.4 (Release)
• Component/s: mx: ComboBox
• Labels: easyfix easytest
• Environment: Affected OS(s): Windows; Affected OS(s): Windows 7; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 03/Aug/10 13:54
• Updated: 10/May/13 01:31

Description

Steps to reproduce:
1. -Create an swfLoader and load an .swf, add a complete event to swfLoader

2. -in the OnComplete load the swfloader.content as Movieclip

3. - add a mx:Combobox to movieclip (movieclip.addChild)

4. Run the application and click on combobox

Actual Results:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.core::ScrollControlBase/updateDisplayList()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\core\ScrollControlBase.as:784]
at mx.controls.listClasses::ListBase/updateDisplayList()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3657]
at mx.controls::List/updateDisplayList()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\List.as:1005]
at mx.controls.listClasses::ListBase/validateDisplayList()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3348]
at mx.controls::ComboBox/getDropdown()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\ComboBox.as:1495]
at mx.controls::ComboBox/displayDropdown()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\ComboBox.as:1552]
at mx.controls::ComboBox/downArrowButton_buttonDownHandler()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\ComboBox.as:1801]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\core\UIComponent.as:9408]
at mx.controls::Button/http://www.adobe.com/2006/flex/mx/internal::buttonPressed()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\Button.as:2504]
at mx.controls::Button/mouseDownHandler()[C:\autobuild\3.4.0\frameworks\projects\framework\src\mx\controls\Button.as:2750]

Expected Results:
dropdows works normally

Workaround (if any):

mask is null in updateDisplayList method, the validate if(mask!= null) but not works