MenuItem

<Style x:Key="CustomMenuI" TargetType="{x:Type MenuItem}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type MenuItem}">
                        <Border x:Name="templateRoot" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                            <Grid VerticalAlignment="Center">
                                <ContentPresenter ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="Center"/>
                                <Popup x:Name="PART_Popup" AllowsTransparency="True" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}">
                                    <Border Width="95" x:Name="SubMenuBorder" BorderBrush="#353535" BorderThickness="1" Background="#262626" Padding="0">
                                        <ScrollViewer x:Name="SubMenuScrollViewer" Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}}">
                                            <Grid RenderOptions.ClearTypeHint="Enabled">
                                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
                                            </Grid>
                                        </ScrollViewer>
                                    </Border>
                                </Popup>
                            </Grid>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSuspendingPopupAnimation" Value="True">
                                <Setter Property="PopupAnimation" TargetName="PART_Popup" Value="None"/>
                            </Trigger>
                            <Trigger Property="IsHighlighted" Value="True">
                                <!--This is for the colour on hover-->
                                <Setter Property="Background" TargetName="templateRoot" Value="#232323"/>
                                <Setter Property="BorderBrush" TargetName="templateRoot" Value="#282828"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="#FF707070"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>