Problem with pass parameter Using @Environmental

[Bo Gao]

I have a 2 nested component.
I pass Parameters Using @Environmental service.

Code in Outer Component:

        void beginRender() {
                environment.push(MyData.class, data);
        }
        void afterRender() {
                environment.pop(MyData.class);
        }

Code in inner Component

        @Environmental
        private MyData data;


It works well.

Then I want to put my first component in an ProgressiveDisplay, 
When should I call environment.push() ?

I try like this:

In my outer Component:

        @OnEvent(EventConstants.PROGRESSIVE_DISPLAY)
        void onLoad() {
                environment.push(MyData.class, getData());
        }


I think this would work, but if it works, where should I call environment.pop()?

I got an Error:

org.apache.tapestry5.ioc.util.UnknownValueException
No object of type org.test.MyData is available from the Environment.
availableValues
Environmentals:

org.apache.tapestry5.RenderSupport
org.apache.tapestry5.ValidationDecorator
org.apache.tapestry5.internal.services.DocumentLinker
org.apache.tapestry5.services.ClientBehaviorSupport
org.apache.tapestry5.services.FormSupport
org.apache.tapestry5.services.Heartbeat
org.apache.tapestry5.services.javascript.JavaScriptSupport
org.test.MyData

It's strange that It says MyData not found, but there are MyData in 
availableValues.

Many Thanks.

--
Bo Gao
eli...@gmail.com