Group column in an ADF Rich Table

I noticed a small new group feature in the new JDeveloper 11G Rich Table component. You can group table columns together in a group column. Here you see an example of a rich table with two groups.

You can achieve this by dragging a viewobject from the datacontrol and selecting a table layout. Just select a few columns and press the group button.
JDeveloper creates a new column with the selected employee columns as childern