Set custom attached property on StoryBoard
问题 I have a storyboard and would like to set the attached property VisualStateUtility.InitialState. I've tried various combinations, but the property never gets resolved. I get the following error: Cannot resolve TargetProperty (VisualStateUtility.InitialState) How can I set the value of my custom attached property on the Storyboard? <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Fully.Qualified.Namespace.VisualStateUtility.InitialState)" Storyboard.TargetName=