Ball moves in a constant speed
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Canvas Margin="5">
<Ellipse Name="ball1" Canvas.Left="10" Canvas.Top="50" Width="20" Height="20">
<Ellipse.Fill>
<RadialGradientBrush>
<GradientStop Color="Gold" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</RadialGradientBrush>
</Ellipse.Fill>
</Ellipse>
<Canvas.Triggers>
<EventTrigger RoutedEvent="StackPanel.Loaded">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="ball1"
Storyboard.TargetProperty="(Canvas.Left)" To="310"
Duration="0:0:50" RepeatBehavior="Forever" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Canvas.Triggers>
</Canvas>
</UserControl>
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