VisualStateGroup.CurrentStateChanging Event
Occurs when a control begins transitioning into a different state.
Namespace: System.Windows
Assembly: System.Windows (in System.Windows.dll)
The event occurs when the control begins to transition states. If a VisualTransition is applied to the state change, this event occurs when the transition begins. If a VisualTransition is not applied, this event occurs after the control goes to the new state before the CurrentStateChanged event.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.