Have you tried using binding util?
> To: flexcoders@yahoogroups.com
> From: nic...@gmail.com
> Date: Fri, 16 Mar 2012 20:08:47 +0000
> Subject: [flexcoders] Bindings on visual components being forgotten? (Flex 3
> -> 4.6)
>
> Seeing a strange, rare, issue after updating an app to 4.6. I can't seem to
> reproduce it in a dev environment, so I'll list out my issue and setup to see
> if it sounds familiar to anyone.
>
> The problem:
> Visual components seem to occasionally "forget" the objects they're bound to.
> For instance, I have something like this:
>
> <s:DropDownList
> id="cmbMonth"
> dataProvider="{model.months}"
> selectedItem="@{model.selectedMonth}"
> />
> <s:Label text="{model.selectedMonth}" />
>
> When the problem occurs, the "selectedMonth" in the label component is
> correct, say, February. But the DropDownList will display a blank. Even
> though the DropDownList contains all the months, meaning models.months is
> bound correctly.
>
> I tried adding:
> requireSelection="true"
>
> The addition changed the behavior. No more blanks! But now, instead of
> blanks, selectedMonth is showing something random like "May".
>
> Background:
> App has been in production in various versions of Flex 3 for two years
> without ever seeing this. Upgrading to Flex 4 and swapping out some Halo
> components with equivalent Spark ones, users, myself included, began noticing
> this phenomenon. I cannot seem to reproduce it in a reliable fashion. But
> I've gotten some feedback based on some attempted fixes pushed out to users.
>
> Troubleshooting so far:
> Since it normally works, there's no super-obvious things missing, like an
> uninitialized pointer, missing "Bindable" tag, accidental = assignment
> instead of == comparison, etc.
>
> Also, we know the variable references are pointing to the correct place.
> model.selectedMonth is showing up fine for a label just underneath the
> dropdown. model.months is being referenced just fine by the dropdown itself.
> It's just the display of model.selectedMonth in the dropdown. Upon saving,
> the model.month property correctly propagates itself to the DB, even when the
> dropdown is displaying the wrong value. Switching between one-way and
> two-way bindings don't seem to make a difference either. I noted above that
> I tried forcing requireSelection="true", which does prevent the DropDownList
> from being blanked-out, but doesn't force it to stay on the correct value.
>
> I thought it might be related to just the DropDownList component, but the
> problem is also occurring on s:TextInput's text property. Seems like when it
> happens with the TextInput component (showing a blank value), it's doing so
> for all the TextInput components. I'm not so sure if it's happening for all
> DropDownList elements, though.
>
>
> App setup:
> I have an mx:ViewStack attached to hide/show effects with two containers
> inside (loggedOff/loggedOn), and a TabNavigator within that. I think the
> problems are only occurring after switching between states for the ViewStack.
> So after the components are hidden and come back. I remembered back to the
> Flex 2 ViewStack issue where bindings didn't refresh, and added the old
> workaround to my code:
> change="executeBindings(true)"
>
> This didn't fix it. Anything else I can look at or try? Anyone else
> experience this before? Any chance it's related to the framework instead of
> my code?
>
>
>
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