how to use the "tabs" widget

i want to use different tabs to show different contents ,there are six,  but  the "tabs" widget only have 5 tabs ,and i don't know how to add ,so how can i use it to solve my trouble

We already had this problem in a project, and the solution was to copy the TAB widget to our application, and add more tabs. From there, do not use the referenced tab anymore, but rather the one you copied to your application.