XAML,WPF,Анимация в стиле

Я пытаюсь сделать стиль кнопки с анимацией и присвоить нескольким кнопкам. У меня есть стиль:

<Style x:Key="ButtonStyle2" TargetType="{x:Type Button}">
            <Style.Triggers>
                <EventTrigger RoutedEvent="MouseEnter">
                        <EventTrigger.Actions>
                            <BeginStoryboard>
                            <Storyboard TargetProperty="тут не знаю что написать">
                                    <DoubleAnimation To="10"
                                         Duration="0:0:1" 
                                         SpeedRatio="3"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger.Actions>
                    </EventTrigger>
                <EventTrigger RoutedEvent="MouseLeave">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard TargetProperty="Offset" >
                                <DoubleAnimation To="0"
                                         Duration="0:0:1" 
                                         SpeedRatio="3"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
            </Style.Triggers>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="Padding" Value="2"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderBrush" Value="Transparent"/>
            <Setter Property="HorizontalAlignment" Value="Center"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Background">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FFFF4600" Offset="0"/>
                        <GradientStop Color="Transparent" Offset="0"/>
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
        </Style>

В нём есть анимация. Как мне в анимации обратиться к <GradientStop Color="Transparent" Offset="0"/> свойства Background?