I like the container object. It offers so many options to users. However I have noticed that most users don't really pay attention to container tabs since the tab title is very discreet and can not be formatted by the developper. My suggestion would be to offer more formatting options to the container such as :
- Tab title Font & Background color
- Tab position option (above charts, below or on the sides)
- Tab shape with contouring (in order to bring out tabs like buttons)