In the IDE

When you complete the steps for modifying the declarative component on the page, the visual editor should look something like this:

Visual editor, completed page

Click the Source tab at the bottom of the editor window. You should see the code JDeveloper added for you when you modified the declarative component:

                               
<mc:myMenubar menuLabel="Hello" method1="#{myBean.myMethod}"..>
  <f:facet name="moreMenus">
    <af:menu text="Edit"..>
      <af:commandMenuItem text="Cut"../>
      <af:commandMenuItem text="Copy.."/>
    </af:menu>
  </f:facet>
</mc:myMenubar>

When you run the page in a browser, the page should look similar to this:

Browser, run page