WPF Extensibility Hacks or WEX - Includes EventTrigger, ReactiveTrigger, InvokeMethodAction, InvokeCommandAction etc.

<UserControl x:Class="Wex.Lib.Demo.Views.Demos.StoryBoardAction"
    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"
    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"      
    xmlns:wex="clr-namespace:Wex.Lib.Interactions;assembly=Wex.Lib"                   
    d:DesignHeight="300" d:DesignWidth="400">

    <Canvas>

        <i:Interaction.Triggers>
            <wex:EventTrigger ElementName="btnBegin" EventName="Click">
                <wex:StoryBoardAction StoryBoardKey="storyBoard1" Action="Begin"/>
            </wex:EventTrigger>
            <wex:EventTrigger ElementName="btnStop" EventName="Click">
                <wex:StoryBoardAction StoryBoardKey="storyBoard1" Action="Stop"/>
            </wex:EventTrigger>
            <wex:EventTrigger ElementName="btnPause" EventName="Click">
                <wex:StoryBoardAction StoryBoardKey="storyBoard1" Action="Pause"/>
            </wex:EventTrigger>
            <wex:EventTrigger ElementName="btnResume" EventName="Click">
                <wex:StoryBoardAction StoryBoardKey="storyBoard1" Action="Resume"/>
            </wex:EventTrigger>
        </i:Interaction.Triggers>
        
        <Canvas.Resources>
            <Storyboard Name="myStoryboard"  x:Key="storyBoard1">
                <!-- Animate the center point of the ellipse. -->
                <PointAnimation Storyboard.TargetProperty="Center"
          Storyboard.TargetName="MyAnimatedEllipseGeometry"
          Duration="0:0:5"
          From="20,200"
          To="400,100"
          RepeatBehavior="Forever" />
            </Storyboard>
        </Canvas.Resources>

        <Path Fill="Blue">
            <Path.Data>

                <!-- Describe an ellipse. -->

                <EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
          Center="20,20" RadiusX="15" RadiusY="15" />
            </Path.Data>
        </Path>

        <StackPanel Orientation="Horizontal" Canvas.Left="10" Canvas.Top="265">

            <!-- Button that begins animation. -->

            <Button Name="btnBegin"
        Width="65" Height="30" Margin="2" Content="Begin" />


            <!-- Button that pauses animation. -->

            <Button Name="btnPause"
        Width="65" Height="30" Margin="2" Content="Pause" />


            <!-- Button that resumes animation. -->

            <Button  Name="btnResume"
        Width="65" Height="30" Margin="2" Content="Resume" />


            <!-- Button that stops animation. Stopping the animation returns the
        ellipse to its original location. -->

            <Button  Name="btnStop"
        Width="65" Height="30" Margin="2" Content="Stop" />
        </StackPanel>

    </Canvas>

</UserControl>