Vista - Style binding

Hello.

I’ve built a custom control based on the Control type.
It’s an analog clock with a hand for the seconds.

I wanted to set an animation for each elapsed second.
The animation would simply take the seconds hand from wherever it is to the
next second position (angle).



When I try to set the animation, I get the following error:

This Storyboard timeline tree could not be frozen. Please remove thread-bound
values such as bindings or dynamic resource references.



If I change the “To� property value from a binding to a discrete value, it
works fine.
Do you have any ideas? Thanks a lot.

The style definition in generic.xaml is:

<Style TargetType="{x:Type local:Clock}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:Clock}">
<ControlTemplate.Triggers>
<EventTrigger RoutedEvent="local:Clock.SecondsChanged">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="{Binding Path=SecondsAngle, RelativeSource={RelativeSource
TemplatedParent}}"
Duration="0:0:1" Storyboard.TargetName="SecondsHand"

Storyboard.TargetProperty="(Path.RenderTransform).(RotateTransform.Angle)"
/>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</ControlTemplate.Triggers>
<Path x:Name="SecondsHand" Data="M 50 50 L 50 15 M 50 50 L 50 55"
Stroke="Black">
<Path.RenderTransform>
<RotateTransform x:Name="AngleTransform" CenterX="50" CenterY="50"

Angle="{Binding Path=SecondsAngle, RelativeSource={RelativeSource
TemplatedParent}}" />
</Path.RenderTransform>
</Path>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>