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Your page tabs come form the following tag inside your layout jsp (index.jsp, maximized.jsp of your layout, refer to portal-core.war/layouts)
<p:region regionName='navigation' regionID='navigation'/>
This tab, displays the tabs, that are generated by tabs.jsp(portal-core.war/WEB-INF/jsp/header). Look into this file for implementing your desired functinonality
Thank You for the reply.
I have already done those customizations and achieved the required functionality.
I am more talking about the taglibrary used to generate the top navigation bar itself. By default two level pages were shown in the menu, If I want to add third level for the menu bar I might need to customize the way navigation bar display is developed. Please let me know if you have come across with a third level menu item scenario.
See again the changes has to be done only in tabs.jsp, as thats the place you can put the next level of portal object iteration for ur third level. You can apply any kind of css class and design your tabs.