Changing the selection with the Tab key
You can use the Tab key and the Home and End keys to select objects using the stacking order of the objects.
To select the front object
Press Home
To select the back object
Press End
To select the object in front of the selected object
Press Shift-Tab
To select the object behind the selected object
Press Tab
Note:
Normally Tab steps through all the objects in the document. However, if you select a member of a group (see Select inside), Tab steps through the objects in the group.