Currently, if you set a Storyboard to Play itself once it has completed playing, it will result in Studio locking up and entering an infinite loop and rendering the application permanently unresponsive.

Repro Steps:

1) Create a Studio Project featuring a MainPage.xaml

2) From Animation/Storyboards, create a Storyboard with any name of your choosing.

3) From Interactivity/Triggers, create a StoryboardCompleted Trigger on the RootGrid of the MainPage.

4) In the StoryboardCompleted Trigger's Properties, set the 'Storyboard' to be the Storyboard created in Step 2).

5) In the StoryboardCompleted Trigger's Properties, add an action set to 'ControlStoryboardAction', with the Option to 'Play', and the Storyboard to the Storyboard created in Step 2).

6) Navigate back to Animation/Storyboards, and click on the Storyboard created i Step 2).

Observe the application becoming permanently unresponsive.

Expected Results: Technically, I would actually expect this operation to be possible, as a way to loop a Storyboard with a Trigger.
However, if this is not something we'd consider supporting, then the same Storyboard should likely not appear in the list of Storyboards for the ControlStoryboardAction.