An
object can be selected, deleted, edited, and transformed until it
is tacked down on the image. As soon as it is tacked down, the object
becomes part of the image and can no longer be manipulated.
There are several ways
to tack down an object:
Select a Tack mode so that an object
is either tacked down as soon as it is drawn or as soon as the next
object is drawn.
Tack down selected objects only.
Tack down all objects simultaneously
using the Tack All command.