Dynamically set transition target

Question

We are building an application that has multiple steps. As
each step is completed, I would like it to move off to the left of
the screen with the new screen moving in from the right edge. I am
using multiple states and have created a transition that I would
like to set the targets as the state is changing. The problem is
that the old screen simply disappears, it does not slide away (the
new screen does slide in from the right). Any thoughts?
Code:
<mx:Canvas xmlns:mx="
http://www.adobe.com/2006/mxml"
height="490" width="860"
currentState="{ model.stateManager.current }"
currentStateChanging="prepareForStateChange(event);">
<mx:Script>
<![CDATA[
import mx.states.State;
import mx.events.StateChangeEvent;
[Bindable] private var model : WMModelLocator =
WMModelLocator.getInstance();
private function prepareForStateChange(event :
StateChangeEvent) : void
if (event.oldState != "")
this.leftSlide.fromState = event.oldState;
this.leftSlide.toState = event.newState;
this.leftSlideOldStateEffect.target = persona;
this.leftSlideNewStateEffect.target = plan;
this.leftSlide.effect.play();
]]>
</mx:Script>
<mx:states>
<mx:State name="{ StateManager.STATE_PERSONA }">
<mx:AddChild position="lastChild">
<persona:SelectPersona id="persona" />
</mx:AddChild>
</mx:State>
<mx:State name="{ StateManager.STATE_PLAN }">
<mx:AddChild position="lastChild">
<accum:RetirementPlanning id="plan" />
</mx:AddChild>
</mx:State>
</mx:states>
<mx:transitions>
<mx:Transition id="leftSlide">
<mx:Parallel>
<mx:Sequence id="leftSlideOldStateEffect">
<mx:Move xFrom="0" xTo="-1000" duration="2000" />
<mx:RemoveChildAction />
</mx:Sequence>
<mx:Move id="leftSlideNewStateEffect" xFrom="1000"
xTo="0" duration="2000" />
</mx:Parallel>
</mx:Transition>
</mx:transitions>
</mx:Canvas>

Answer 1

The browser keeps track of the frame for a response, not the servlet.
You can have a separate hidden frame as the target of your request, write the response there, and have JavaScript write from the hidden frame to a visible frame, but that's a real mess.