WPF Animation Completed Event in ControlTemplate

Question

In my WPF application, I have the standard Generic.xaml file, which contains a style for my custom class, Frost.

I need to find a way to hook up the Completed event of one of the animations to my custom Frost class, I cannot do it at runtime because it complains at me that i need to set IsFrozen to false which I do not want to do (because of performance).

How can I hook up events to the TargetType of the control template?

    <Style TargetType="{x:Type Controls:Frost}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Controls:Frost}">
                    <ControlTemplate.Resources>
                     <Storyboard x:Key="OnEndFrost">
                            <DoubleAnimation Name="fadeOutFrostAnimation"
                                             BeginTime="00:00:00" 
                                             Duration="00:00:02"
                                             Storyboard.TargetName="frostElement" 
                                             Storyboard.TargetProperty="(UIElement.Opacity)"
                                             To="0">
                            </DoubleAnimation>
                     </Storyboard>
                    </ControlTemplate.Resources>
                    <Grid>
                        <MediaElement x:Name="frostElement" 
                      LoadedBehavior="Manual"
                      Width="1172" 
                      Height="286.917" 
                                     Source="{TemplateBinding SourceUri}"
                      ScrubbingEnabled="True">
                            <MediaElement.Effect>
              <eff:ChromaKeyAlphaEffect InputColor="#FF0E425E" Tolerance="0.1" />
             </MediaElement.Effect>
            </MediaElement>
                    </Grid>
                    <ControlTemplate.Triggers>
                     <EventTrigger RoutedEvent="Controls:Frost.EndFrost">
                      <BeginStoryboard x:Name="OnEndFrost_BeginStoryboard" Storyboard="{StaticResource OnEndFrost}"/>
                     </EventTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Answer 1

You could create a custom animation and add an eventhandler to it or use a command as dependency property. For a codeproject example of a custom animation look at this link.