Java Development Tools

Hi.

I'm using JDeveloper 11.1.1.7.0

I have followed this tutorial http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_43/jdtut_11r2_43.html to create a basic and plain left-side menu in my application.

This tutorial shows more advance topics, but I have created a simple left-side menu, with a list.

I haved created an unbounded task flow, drag/drop a wildcard, then the views, then the control flows, ... It works perfect

In the JSF template, in the left-side, I have this code:

<af:navigationPane id="pt_np1" hint="list" value="#{supervision_menu}" var="supervisionInfo">
                    <f:facet name="nodeStamp">
                      <af:commandNavigationItem text="#{supervisionInfo.label}" id="pt_cni1"
                                                destination="#{supervisionInfo.destination}"
                                                action="#{supervisionInfo.doAction}"/>
                    </f:facet>
                  </af:navigationPane>

I need an advanced feature, and I want to show/hide some options, based on a parameter.

I need to execute a view object with this parameter, process the results, so I get the information to know which options could be shown or hidden.

So, my questions are:

• How could I force to execute this check as the first step of this flow?
• In generated menu.xml and in af:commandNavigationItem, there are visible  attribute. Where should I place the condition?

Any help would be very appreciated. Thanks