Control storyboard inside custom control...by code

[Jayme65]

Hello, How do I please control (start, stop, pause, go to specific time) a controltemplate storyboard inside a custom control..by code? The XAML:

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}" x:Name="CTarrow">
                    <ControlTemplate.Resources>
                        <Storyboard x:Key="Storyboard1" RepeatBehavior="Forever" AutoReverse="True">
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="rectangle">
                                <DiscreteColorKeyFrame KeyTime="0" Value="#FF0080FF"/>
                                <DiscreteColorKeyFrame KeyTime="0:0:0.5" Value="#FF004D99"/>
                                <DiscreteColorKeyFrame KeyTime="0:0:0.8" Value="#FF0080FF"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </ControlTemplate.Resources>
                    <Grid>
                        <ContentPresenter RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="Center" VerticalAlignment="Center" />
                        <Rectangle x:Name="rectangle" Height="30" Width="50" Fill="Black" />
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>

In these 3 attemps, the debugger complains about not being able to resolve 'rectangle':

Dim myStoryboard As New Storyboard
myStoryboard = Arrow.FindResource("Storyboard1")
myStoryboard.Begin()

Dim myStoryboard As New Storyboard
myStoryboard = CType(Me