The EmptyItemComboBox class posted by David Coleman looks similar to some code I posted years ago on StackOverflow [1]. I added some explanation and a snippet of code showing its usage there.
I'm not particularly proud of this code, but didn't managed to find a better way. The behavior approach seems interesting. [1] http://stackoverflow.com/questions/949180/null-in-flex-combobox Cosma 2012/4/10 Alex Harui <aha...@adobe.com>: > > > > On 4/10/12 12:17 PM, "Jeffry Houser" <jef...@dot-com-it.com> wrote: > >> I gave it a selectedValue property, a valueField property, and a >> valueFunction property; similar--in concept--to how the selectedItem, >> labelField, and labelFunction work. >> >> Really the code is just a layer of abstraction for a loop. If I were >> to implement something like that in the framework, I'd probably to up to >> List or ListBase as opposed to making it ComboBox specific. >> > And for the record, starting in Flex 4, MX Combobox had this function > property [1]. It was not implemented in Spark. But these days I am a fan > of plugging in things like this. > > [1] > http://help.adobe.com/en_US/FlashPlatform//reference/actionscript/3/mx/contr > ols/listClasses/ListBase.html#selectedItemsCompareFunction > > -- > Alex Harui > Flex SDK Team > Adobe Systems, Inc. > http://blogs.adobe.com/aharui >
