TextBlock animiert ein- und ausblenden

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	public static class SmartTextAnimation
	{
		/// <summary>
		/// Add a fading animation to a 'TextBlock'-Control
		/// </summary>
		/// 
		/// <param name="FadingTextList">The generic List of all strings that have to be shown</param>
		/// <param name="TextPromptDuration">The duration of the text prompt in milliseconds</param>
		/// <param name="FadingSpeed">The speed of the text fading animation in milliseconds</param>
		/// 
		/// <returns></returns>
		/// 
		public static void AddSmartFadingAnimation( this TextBlock TextBoxToAnimate, List<string> FadingTextList,
																							  double TextPromptDuration, double FadingSpeed )
		{
			int index = 0;
			DoubleAnimation FadeOutAnimation = new DoubleAnimation()
			{
				Duration = new Duration( TimeSpan.FromMilliseconds( FadingSpeed ) ),
				To = 0, BeginTime = TimeSpan.FromMilliseconds( TextPromptDuration )
			};
			DoubleAnimation FadeInAnimation = new DoubleAnimation()
			{
				Duration = new Duration( TimeSpan.FromMilliseconds( FadingSpeed ) ),
				To = 1, BeginTime = TimeSpan.FromMilliseconds( TextPromptDuration + FadingSpeed )
			};

			Storyboard FadeInAndOutStoryboard = new Storyboard() { RepeatBehavior = RepeatBehavior.Forever };
			Storyboard.SetTargetProperty( FadeOutAnimation, new PropertyPath( "(Opacity)" ) );
			Storyboard.SetTargetProperty( FadeInAnimation, new PropertyPath( "(Opacity)" ) );
			Storyboard.SetTarget( FadeOutAnimation, TextBoxToAnimate );
			Storyboard.SetTarget( FadeInAnimation, TextBoxToAnimate );

			FadeInAndOutStoryboard.Children.Add( FadeOutAnimation );
			FadeInAndOutStoryboard.Children.Add( FadeInAnimation );

			TextBoxToAnimate.Text = FadingTextList[index++];

			FadeOutAnimation.CurrentStateInvalidated += new EventHandler( (sender, eArgs) =>
			{
				if ( (sender as Clock).CurrentState == ClockState.Filling )
				{
					TextBoxToAnimate.Text = FadingTextList[index];
					if (++index == FadingTextList.Count) index = 0;
				}
			} );

			FadeInAndOutStoryboard.Begin();
		}
	}