I'm trying to animate a RadialGradientBrush in my application. I get the super helpful exception:

Additional information: 'System.Windows.Style' value cannot be assigned to property 'Style' of object 'System.Windows.Controls.Border'. '[Unknown]' property does not point to a DependencyObject in path '(0).(1).[0].(2)'. Error at object 'System.Windows.Style' in markup file 'Eng.Modules.Core;component/system/grid/systemgridview.xaml' Line 252 Position 51.

I know it's something wrong with the indirect property targeting or partial path qualification in my DoubleAnimation's Storyboard.TargetProperty attribute. Any ideas?

<Border>
  <Border.Resources>
    <RadialGradientBrush x:Key="SomeBrush">
      <RadialGradientBrush.GradientStops>
        <GradientStop Color="White" Offset="0" />
        <GradientStop Color="Gold" Offset="1" />
      </RadialGradientBrush.GradientStops>
    </RadialGradientBrush>
  </Border.Resources>
  <Border.Style>
    <Style TargetType="{x:Type Border}">
      <Style.Triggers>
        <DataTrigger Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}}" Value="True">
          <Setter Property="Background" Value="{StaticResource SomeBrush}" />
          <DataTrigger.EnterActions>
            <BeginStoryboard x:Name="SomeStoryBoard">
              <Storyboard>
                <!-- RIGHT HERE -->
                <DoubleAnimation
                  Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Offset)"
                  From="0" To="1" Duration="0:0:1"
                  RepeatBehavior="Forever"
                  AutoReverse="True" />
              </Storyboard>
            </BeginStoryboard>
          </DataTrigger.EnterActions>
          <DataTrigger.ExitActions>
            <RemoveStoryboard BeginStoryboardName="SomeStoryBoard" />
          </DataTrigger.ExitActions>
        </DataTrigger>
      </Style.Triggers>
    </Style>
  </Border.Style>
</Border>