Tweaking Animations with Timeline Properties
Now is a good time to look at the Timeline properties that are useful for every animation, whether it’s a custom animation or a theme animation.
BeginTime
If you don’t want an animation to begin immediately when you call its storyboard’s Begin method (or trigger it via XAML), you can insert a delay by setting BeginTime to an instance of a TimeSpan:
<DoubleAnimation To="100" BeginTime="0:0:2" />
This delays the animation by two seconds.
Besides being potentially useful in isolation, BeginTime can be useful for specifying a sequence of animations that start one after the other. You can even set BeginTime to a negative value:
<!-- Start the ...
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