/// <summary>
 /// Called when the active image viewer has changed.
 /// </summary>
 protected virtual void OnActiveImageViewerChanged(ActiveImageViewerChangedEventArgs e)
 {
 }
		/// <summary>
		/// Called when the active image viewer has changed.
		/// </summary>
		protected virtual void OnActiveImageViewerChanged(ActiveImageViewerChangedEventArgs e)
		{
		}