Is ActivityIndicatorBarItem supposed to animate if the “animating” property is set to true? I would like to have a spinning animation in the navigation bar, however it does not initially spin when animating is set to true. The showcase example (ExamplePage.xml) uses this control and it also does not initially spin, only if when the IconButtonBarItem is toggled. Even then, it only spins for a few seconds. Is this intended? Is there a way I can get it spin indefinitely?