Tabs in Balsamiq Mockups

I want to open a window in the same mockup after clicking on each tab. Currently, if I provide a link for a particular tab then it opens a new mockup rather than showing it in a tab window.Here is the image:-

So on the click of Authority window, some mockup should open up in the below free area.Same for other tabs.I think there should be some way around to make this as basic purpose of tab is same.Please help!