A small update to the Ribbon control: Contextual Ribbon Tabs.
Some controls should only appear when a particular object is selected because they only affect the configuration of that object. This is why Contextual Ribbon Tabs exist. They only appear when a particular object is selected and disappear when it looses its selection.
To differentiate themselves from regular Ribbon Tabs they appear with a different color, they can also be composed of more than one Tab. In the picture below the Contextual Ribbon Tab appears in blue.