[Zope] how to add pages to a new tab in plone

[prabuddha ray]

hope i get this through !!!

In my plone site I've added a portal_tab through portal_actions.
i've made a subfolder in my plone site root folder for it.

I gave the path in the action value field of the tabs as :
string:$portal_url/consumables

now the problem is that when i click on my tab the index_html zpt
opens seperately as a new page unlike the home tab's index page which
opens inside the plone site .

i want the pages in my tab to added as the plone site's content, not seperately.
how do i do it.

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