Add another trigger into my CheckBox style

I have this CheckBox style:

    <Style TargetType="{x:Type CheckBox}">
        <Setter Property="SnapsToDevicePixels" Value="true" />
        <Setter Property="OverridesDefaultStyle" Value="true" />
        <Setter Property="Height" Value="20" />
        <Setter Property="FocusVisualStyle" Value="{DynamicResource MyFocusVisualStyte}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type CheckBox}">
                    <BulletDecorator>
                        <BulletDecorator.Bullet>
                            <Grid Height="{TemplateBinding Height}" Width="{Binding RelativeSource={RelativeSource Self}, Path=Height, UpdateSourceTrigger=PropertyChanged}"
                          MinHeight="20" MinWidth="20" ShowGridLines="False">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="4*" />
                                    <ColumnDefinition Width="1*" />
                                    <ColumnDefinition Width="1*" />
                                    <ColumnDefinition Width="4*" />
                                    <ColumnDefinition Width="1*" />
                                    <ColumnDefinition Width="1*" />
                                    <ColumnDefinition Width="2*" />
                                    <ColumnDefinition Width="2*" />
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="3*" />
                                    <RowDefinition Height="1*" />
                                    <RowDefinition Height="1*" />
                                    <RowDefinition Height="1*" />
                                    <RowDefinition Height="4*" />
                                    <RowDefinition Height="1*" />
                                    <RowDefinition Height="1*" />
                                    <RowDefinition Height="4*" />
                                </Grid.RowDefinitions>

                                <Border Name="MainBorder"
                                Grid.ColumnSpan="9" Grid.RowSpan="9"
                                CornerRadius="4"
                                BorderThickness="1"
                                Background="Transparent" />

                                <Border Name="InnerBorder"
                                Grid.Column="1" Grid.ColumnSpan="5"
                                Grid.Row="2" Grid.RowSpan="5"
                                BorderThickness="1"
                                BorderBrush="Gray" />

                                <Path Name="InnerPath"
                              Grid.Column="1" Grid.ColumnSpan="5"
                              Grid.Row="2" Grid.RowSpan="5"
                              Data="M31,5 L19.5,5 19.5,19.5 34.5,19.5 34.5,11.75"
                              Stretch="Fill" Stroke="Gray"/>

                                <Path Name="CheckMark"
                              Grid.Column="2" Grid.ColumnSpan="5"
                              Grid.Row="1" Grid.RowSpan="5"
                              Opacity="0"
                              Data="M9.07743946676476E-09,4.31805768640244L4.68740335877841,8.86361158398516C4.68740335877841,8.86361158398516,16.3281249985376,-2.42451336648723,16.3281249985376,-2.42451336648723L14.0622100581796,-4.77304938341948 4.68740335877846,4.31805791992662 2.22656251699567,1.93164208562579z"
                              Fill="#3babe3"
                              Stretch="Fill"
                              Stroke="#3babe3" />

                                <Path Name="InderminateMark"
                              Grid.Column="3"
                              Grid.Row="4"
                              Data="M0,4 L1,5 5,1 4,0"
                              Opacity="0"
                              Stretch="Fill"
                              StrokeThickness="0"
                              Fill="#808080" />
                            </Grid>
                        </BulletDecorator.Bullet>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CheckStates">
                                <VisualState x:Name="Checked">
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                         Storyboard.TargetName="CheckMark" Duration="0:0:0.2" To="1" />
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Unchecked" >
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                         Storyboard.TargetName="CheckMark" Duration="0:0:0.2" To="0" />
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Indeterminate">
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                         Storyboard.TargetName="InderminateMark" Duration="0:0:0.2" To="1" />
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <ContentPresenter Margin="4,0,4,0"
                    VerticalAlignment="Center"
                    HorizontalAlignment="Left"
                    RecognizesAccessKey="True" />
                    </BulletDecorator>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="True">
                            <Setter TargetName="InnerBorder" Property="Visibility" Value="Collapsed" />
                        </Trigger>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="MainBorder" Property="Background" Value="#81d2eb" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="CheckMark" Property="Fill" Value="#cccccc" />
                            <Setter TargetName="CheckMark" Property="Stroke" Value="#cccccc" />
                            <Setter TargetName="InnerPath" Property="Stroke" Value="#cccccc" />
                            <Setter TargetName="InderminateMark" Property="Fill" Value="#cccccc" />
                            <Setter TargetName="InnerBorder" Property="BorderBrush" Value="#cccccc" />

                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Now i want to add another Trigger for IsEnabled property:

<Setter Property="Foreground" Value="#55649EB4"/>

But it seems that this not effect at all when the controller IsEnables = false. Maybe i need to add TargetName as well ?