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    <p>On the storyboard there is a SpeedRatio setting which is a multiplier to the duration. You cannot bind to this however as it is not a dependency property.</p> <p>To get around this you can use the SetSpeedRatio function on the storyboard. Note this only works if the story board is started in code (other wise you get an error).</p> <p>The code below is an full example of how you would raise event in an object to effect the speed of the animation of a spinning rectangle. The purpose of the textbox and data bindings are to update the background object. The button is just so the textbox looses focus and updates the object.</p> <pre><code>&lt;Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"&gt; &lt;StackPanel&gt; &lt;Rectangle Margin="50" Width="50" Height="50" Fill="Red" x:Name="rc"&gt; &lt;Rectangle.RenderTransform&gt; &lt;RotateTransform x:Name="TransRotate" CenterX="25" CenterY="25" Angle="0" /&gt; &lt;/Rectangle.RenderTransform&gt; &lt;Rectangle.Resources&gt; &lt;Storyboard x:Key="spin"&gt; &lt;DoubleAnimation x:Name="da" Storyboard.TargetName="TransRotate" Storyboard.TargetProperty="Angle" By="360" Duration="0:0:10" AutoReverse="False" RepeatBehavior="Forever" /&gt; &lt;/Storyboard&gt; &lt;/Rectangle.Resources&gt; &lt;/Rectangle&gt; &lt;TextBox Text="{Binding Speed}" /&gt; &lt;Button&gt;Update Speed&lt;/Button&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p>Then the C# code</p> <pre><code>{ public Window1() { InitializeComponent(); //create new object BackgroundObject bo = new BackgroundObject(); //binding only needed for the text box to change speed value this.DataContext = bo; //Hook up event bo.SpeedChanged += bo_SpeedChanged; //Needed to prevent an error Storyboard sb = (Storyboard)rc.FindResource("spin"); sb.Begin(); } //Change Speed public void bo_SpeedChanged( object sender, int newSpeed) { Storyboard sb = (Storyboard)rc.FindResource("spin"); sb.SetSpeedRatio(newSpeed); } } public delegate void SpeedChangedEventHandler(object sender, int newSpeed); public class BackgroundObject { public BackgroundObject() { _speed = 10; } public event SpeedChangedEventHandler SpeedChanged; private int _speed; public int Speed { get { return _speed; } set { _speed = value; SpeedChanged(this,value); } } } </code></pre> <p>I am sure you can adapt to your usage.</p>
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    1. COThat would be appreciated very much.
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    2. COThanks, I will be able to use that. Funny that we have to make a method call (SetSpeedRatio), which means I cannot animate the speed ratio change with another animation, all in Xaml and all; but this looks much more correct than applying new animations all the time to get the effect. Thank you.
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    3. COThis answer was most useful in our case but there is one important difference that didn't make it work. at least with WPF in WinRT. The method SetSpeedRatio() didn't do anything so we changed it to the property SpeedRatio and that did the trick.
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