Programmatic Navigation invoked by Contextual Events

Question

Using JDeveloper 11.1.1.3.0
I'm having trouble doing a programmatic navigation triggered by a contextual event in the case of layered bounded taskflows.
My scenario has 2+ taskflows.
TaskFlow 1: BoundedTF called Main-Task-Flow - This is the starting URL invoked to run.
TaskFlow 2: BoundedTF called Dashboard-Task-Flow - This is the default activity in the Main-Task-Flow
Both of these does not use page fragments.
Dashboard-Task-Flow has a page, let's call this Dashboard.jspx which registers a contextEventMap. This map basically utilizes a NavigationHandler to navigate to a TaskFlowReturn activity.
Return activity is registered in the Main-Task-Flow to navigate to different taskflows.
I noticed, that only when i call this navigation case using contextEvent, i am getting an invalid view port. Which starts with these:
<UNMATCHED_STATE_ON_STACK><v5hztfeem_0> v5hztfeem_15
<RegistrationConfigurator><handleError> Server Exception during PPR, #1
javax.servlet.ServletException: ADFC-14000: View port ID 'v5hztfeem_15' is invalid.
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
etc...
Caused by: oracle.adf.controller.internal.InvalidViewPortIdException: ADFC-14000: View port ID 'v5hztfeem_15' is invalid.
     at oracle.adfinternal.controller.state.ControllerState.setCurrentViewPort(ControllerState.java:1245)
     at oracle.adfinternal.controller.ControllerContextImpl.setCurrentViewPort(ControllerContextImpl.java:133)
     at oracle.adfinternal.controller.ControllerContextImpl.setCurrentViewPort(ControllerContextImpl.java:52)
etc....
I've been trying to figure if it was coding wise, but i simply use the NavigationHandler being triggered by a button then it works.
So i tried something else, i placed the Dashboard.jspx directly in Main-Task-Flow and this issue is gone. I tried debugging the currentView and it all prints correct that i'm in Dashboard.jspx.
I wonder if i'm doing something wrong here. I tried searching for this exception and i barely find any information about it.

Answer 1

Thanks for the reply,
I am currently using the 2nd mechanism for accessing the bean which contains the bindings of the page components (e.g panelTabbed).
What I want is to do it in the same bean, without the need of resolving expressions (now I can resolve the expression ${beanName.panelTabbed}) - I think there should be a cleaner way.
There's got to be a way to consume the contextual event in the same binding context!