[FLEX-28700] DropdownList error on key finding

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK 4.0 (Release)
• Component/s: Spark: List
• Environment: Affected OS(s): Windows; Affected OS(s): Windows; Browser: Other (specify version); Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 04/Oct/11 03:18
• Updated: 04/Oct/11 03:18

Description

Steps to reproduce:
1. Set up the attached project
2. Launch TestDropDown application
3. Select the second dropdown list and type in the "t" letter twice

Actual Results:
The second input will produce a runtime error (Null Error)

Expected Results:
The second input shouldn't produce any error, and the highlighted item should be "tata"

Workaround (if any):
The labelFunction should never return a null statement

Actually i reproduced the bug with Flex 4.5.1 aswell.
I overrided the DropdownList (even though the bug is nested in the List component), and added a test before using the result of the labelFunction return.
In the project you'll find a component named AdvancedDropDownList with the specified changes at line #23.

Sorry for my not so good english, and i hope you'll understand my means.