Xaml Triger не срабатывает

привет есть стиль

            <ControlTemplate.Triggers>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsMouseOver" Value="True"/>
                        <Condition Property="IsEnabled" Value="True"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="RenderTransform" TargetName="CellBorder">
                        <Setter.Value>
                            <TransformGroup>
                                <ScaleTransform ScaleX="1.1" ScaleY="1.1"></ScaleTransform>
                            </TransformGroup>
                        </Setter.Value>
                    </Setter>
                    <MultiTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard x:Name="EnterMouse">
                                <ColorAnimation Storyboard.TargetName="CellColor"
                                                Storyboard.TargetProperty="Color"
                                                To="{StaticResource MouseOver}"
                                                Duration="0:0:0:0"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </MultiTrigger.EnterActions>
                    <MultiTrigger.ExitActions>
                        <BeginStoryboard>
                            <Storyboard x:Name="LeaveMouse">
                                <ColorAnimation Storyboard.TargetName="CellColor"
                                                Storyboard.TargetProperty="Color"
                                                To="{StaticResource MouseLeave}"
                                                Duration="0:0:0:0"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </MultiTrigger.ExitActions>
                </MultiTrigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Background">
                        <Setter.Value>
                            <SolidColorBrush Color="#EEE"/>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </ControlTemplate.Triggers>

Но почему то не работает кусок

<Trigger Property="IsEnabled" Value="False">
                        <Setter Property="Background">
                            <Setter.Value>
                                <SolidColorBrush Color="#EEE"/>
                            </Setter.Value>
                        </Setter>
                    </Trigger>

Когда делаю кнопку не активной цвет не меняется.Что не так?