The short answer On release If near You can use coordinates or object boundries.
FYI as sprites can not pass across scenes You may wish to either initiate in a background scene or target your actions to other sprites.
As well make sure you are keenly aware of what targets are and where the paths are in relation. As soon as you mark an object as a target swishmax wraps a sprite around the target. Sprites (Must be named) are automatically targets. When you drag you are dragging the sprite or level.