How to add a custom tab in the k2 item view ? so that i will not use any 3rd pary plug in, and i can use the default k2 article to place any module for other components?

the picture attache is a plugin sw tab, we had problem with that, now how can i edit item.php to include a custom tab lets say 8 tabs default so that i can use that as place holder of any additional content?

Can you try this tutorial: docs.joomla.org/Using_the_JHtmlTabs_class_in_a_component

I have not checked it yet, but I think it is possible to use it, although you may need some more code to get it work.