Revit 2010: Contextual Ribbon Tabs

"When you execute certain commands or select an element, a special contextual ribbon tab displays that contains a set of tools that relate only to the context of the command.

For example, when drawing walls, the Place Wall contextual tab displays that has 3 panels:

• Select: contains the Modify command.
• Element: contains Element Properties and the Type Selector.
• Draw: contains the draw editors necessary for creating the wall.

This contextual ribbon tab closes once you end the command.

"