One of my colleagues is working with a tab control. He has several tabs. He is trying to embed another tab control inside one of the tabs of the first tab control. He had placed the second tab control inside one of the tabs of the first tab control. But the problem is that the second tab control does not show up (unless one goes to the block diagram and double clicks the second tab control, only then does it shows up; when the vi is closed and reopened its again not there). I told him that I had never seen such functionality (a tab control inside another tab control) in any application but is it somehow possible. All this is required while the VI is not running and is being developed (of course it should work at run time, but this functionality must show while the VI is not running, i.e., this functionality should be non-programmatic. Is it possible. Thanks for your time.