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.