WPF ItemsControl DataTrigger EnterActions Animation not starting - wpf

Question

I have a problem with an animation within a template of an ItemsControl that is part of the template of another ItemsControl. I want a path, that is representing an Icon, to change its color and constantly rotate when a certain condition becomes true.
The DataTrigger generally works, causing the Fill of the Path changing from Gray to LightGreen when the producing Property changes to true. However, the animation does not start. When I let the animation start with the Loaded Event (as you can see in the commented section), it starts properly. So I know that the animation, as well as the DataTrigger, is configured correctly.
When I put the same Path (just copy and paste) in the outside ItemsControl and change the DataTrigger to a Property of the corresponding DataType, the animation also works as expected. So there seems to be a problem with the nested ItemsControls, but I have no idea what it might be.
<ItemsControl ItemsSource="{Binding Computers}">
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type models:ClientComputerWrapper}">
<Border Margin="5" BorderBrush="Black" BorderThickness="1" Padding="5">
<StackPanel>
<!-- Some Content -->
<ItemsControl ItemsSource="{Binding PlcReaderStatuses}">
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type resources:PlcReaderStatusResource}">
<DockPanel LastChildFill="False">
<!-- Some Content -->
<Path DockPanel.Dock="Left" HorizontalAlignment="Left" Data="{StaticResource GearIconGeometry}" Stretch="Uniform" RenderTransformOrigin="0.5, 0.5">
<Path.RenderTransform>
<RotateTransform x:Name="gearPathTransform"/>
</Path.RenderTransform>
<Path.Style>
<Style TargetType="Path">
<Setter Property="Fill" Value="Gray"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsProducing}" Value="True">
<Setter Property="Fill" Value="LightGreen"/>
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="rotateStoryBoard">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(Path.RenderTransform).(RotateTransform.Angle)" To="360" Duration="0:0:2" RepeatBehavior="Forever"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<RemoveStoryboard BeginStoryboardName="rotateStoryBoard"/>
</DataTrigger.ExitActions>
</DataTrigger>
<EventTrigger RoutedEvent="Loaded">
<!--<BeginStoryboard x:Name="rotateStoryBoard">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(Path.RenderTransform).(RotateTransform.Angle)" To="360" Duration="0:0:2" RepeatBehavior="Forever"/>
</Storyboard>
</BeginStoryboard>-->
</EventTrigger>
</Style.Triggers>
</Style>
</Path.Style>
</Path>
</DockPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

Answer 1

I've finally found a solution. After trying to replace the DoubleAnimation with a ColorAnimation, using (Path.Fill).(SolidColorBrush.Color) as TargetProperty, I received an error that the path is not pointing to a DependencyProperty. This was only solved when I defined the SolidColorBrush explicitly in a Setter which led my to try the same with the RenderTransform of the Path:
<Path.Style>
<Style TargetType="Path">
<Setter Property="RotateTransform">
<Setter.Value>
<RotateTransform x:Name="gearPathTransform"/>
</Setter.Value>
</Setter>
<!-- ... -->
</Style>
Afterwards the animation works as expected. I still don't know why this is only necessary in the inner ItemsControl and it is also nasty that there is no error as is for the ColorAnimation, but at least it is working now.