The Exchange Cast Members command changes the cast member associated with a particular sprite to the currently selected cast member. In other words, it replaces the member reference for the selected sprite with the member reference of the selected cast member.
This command modifies the selected sprites in the Score; it doesnt modify cast members. The command is enabled only when both a sprite and a cast member are selected.
If multiple cast members are selected, the command associates only the first selected cast member with the sprite.
You can execute this command while the movie is playing.
The selected cast member is associated with the sprite.