Telerik UI for Windows Phone by Progress

The easing functions are a feature of the Silverlight framework. They are represented by a mathematical formula, which gets applied to the animation. These formulas allow the animations to look much more realistic. For example, you can define an object to behave as if it actually bounces or is attached to a spring.

You can read more about easing functions here.

In order to define an easing function for RadAnimation you have to use its Easing property. Here is an example.

    <telerikCore:RadMoveAnimation x:Key="moveAnimation" StartPoint="100,300" EndPoint="100,0">
            <BounceEase Bounces="2" EasingMode="EaseOut" Bounciness="2" />

<Grid x:Name="LayoutRoot" Background="{StaticResource PhoneBackgroundBrush}">
    <Rectangle x:Name="animatedRectangle" Width="100" Height="100" Fill="#FF00BDD2" />
RadMoveAnimation slideAnimation = this.Resources["moveAnimation"] as RadMoveAnimation;
if (slideAnimation != null)
    RadAnimationManager.Play(this.animatedRectangle, slideAnimation);