Usage

A group box is a container used to organize content in a view (page, panel or dialog). By default the Group Box includes a header and a content region. The border may be added as an option.

The group box has two header options to provide visual hierarchy between containers if needed.
A group box header may contain controls that uniquely act on its contents.
There are other options that allow the Group Box to be emphasized or deemphasized as needed. These include; Border On-Off, Header On-Off, and Indentation. Indentation affords an opportunity to differentiate groups of content on complex pages.
The IFB Category Box maps to the large header.

Options

Header: Yes/No
Header Size: Large/Medium
Header Controls Left: On/Off
Header Controls Right: On/Off
Border: Yes/No

References

Visual Spec
Accessibility and Keyboard Access