Opps Wrong Forum Sorry.
No. This is the right forum.
The reason there are no tabs, is because the navigationPortlet is not defined for that page.
The tabs are not mere "tabs", but an actual navigationPortlet that is assigned to the layout's "navigation region".
Check the page you have defined for your test portlet.
Make sure that the page that contain's the window that contains the test portlet instance als includes a Navigation window in the navigation region.
This navigation window should include a navigation portlet instance.
You can find an example of this in the default pages defined in default-object.xml in the portal-core-war.
If you created the page and put the portlet on it using the admin portlets, then you will need to define a window using the Navigation portlet instance and include this on your new page.
Roy beat me to it. :( -- E-mail watching has lag!