RemoveSelectionCommand.as

When the user closes a section of the Timeline (such as clicking a “Chapter” button when the Timeline is already displaying its Scenes), then it and the sections below it in the hierarchy must be removed from the SelectionContext. For instance, when a selected Chapter is clicked to deselect it, the Story or Part containing it should be selected, causing the Chapter and its Scenes to be deselected by the logic inside the corresponding selection method on the SelectionContext.