I was working on a project where I wanted to have one storyboard start right after another completed. I was using the ControlStoryboardAction behavior that ships with Blend 3 and knew it must be simple but didn’t get it right away.

Answer:  Just use the “ControlStoryboardAction” to play your second storyboard, and set its trigger as a “StoryboardCompletedTrigger”, with your first storyboard as a reference.

Simple huh?