There's two things to keep in mind when pondering bindings:

1) Bindings work on "property chains", using chains of ChangeWatcher
instances. It's only a couple of pages of code, and pretty easy to get your
head around. You're right that they simply "stop" when they get to a null,
and return null.
2) Everything inside your "{}" when you bind in MXML goes into a function,
which is called wrapped inside a try{}/catch{}, and exceptions that are
thrown by it are simply ignored.

-Josh

On Mon, Dec 1, 2008 at 2:33 AM, Dave Kong <[EMAIL PROTECTED]> wrote:

>  I dont know any docs, but I think it happened to me a couple of times and
> the result is that the databinding simply does not fire for any changes
> after the null in the chain.
>
> Do a simple test app and try it out. it will be faster than you looking for
> the doc.
>
>
> On Fri, Nov 28, 2008 at 12:01 PM, Michael Prescott <
> [EMAIL PROTECTED]> wrote:
>
>>   Is there any reference material that describes how Flex behaves when it
>> encounters a null part way along a data binding chain?
>>
>> Michael
>>
>
> 
>



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