VRCMelonAssistant/VRCMelonAssistant/Styles/MenuItem.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="MenuItem">
        <Setter Property="Background" Value="{DynamicResource ButtonBackground}" />
        <Setter Property="BorderBrush" Value="{DynamicResource ButtonBackground}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Foreground" Value="{DynamicResource TextColor}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type MenuItem}">
                    <Border
                        x:Name="templateRoot"
                        BorderBrush="{DynamicResource ButtonOutline}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        Padding="4"
                        Background="{TemplateBinding Background}"
                        SnapsToDevicePixels="True">
                        <Grid VerticalAlignment="Center">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <ContentPresenter x:Name="Icon" Content="{TemplateBinding Icon}" ContentSource="Icon" HorizontalAlignment="Center" Height="16" Margin="3" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" Width="16"/>
                            <Path x:Name="GlyphPanel" Data="F1M10,1.2L4.7,9.1 4.5,9.1 0,5.2 1.3,3.5 4.3,6.1 8.3,0 10,1.2z" Fill="{TemplateBinding Foreground}" FlowDirection="LeftToRight" Margin="3" Visibility="Collapsed" VerticalAlignment="Center"/>
                            <ContentPresenter ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" Grid.Column="1" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            <Popup x:Name="PART_Popup" AllowsTransparency="True" Focusable="False" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" Placement="Bottom">
                                <ScrollViewer x:Name="SubMenuScrollViewer" Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}}">
                                    <Grid RenderOptions.ClearTypeHint="Enabled">
                                        <Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="1">
                                            <Rectangle x:Name="OpaqueRect" Fill="Black" Height="{Binding ActualHeight, ElementName=SubMenuBorder}" Width="{Binding ActualWidth, ElementName=SubMenuBorder}"/>
                                        </Canvas>
                                        <Rectangle Fill="#FFD7D7D7" HorizontalAlignment="Left" Margin="29,2,0,2" Width="1" />
                                        <ItemsPresenter x:Name="ItemsPresenter" Margin="0,0,0,0" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
                                    </Grid>
                                </ScrollViewer>
                            </Popup>
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsSuspendingPopupAnimation" Value="True">
                            <Setter Property="PopupAnimation" TargetName="PART_Popup" Value="None"/>
                        </Trigger>
                        <Trigger Property="Icon" Value="{x:Null}">
                            <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="IsChecked" Value="True">
                            <Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
                            <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="IsHighlighted" Value="True">
                            <Setter Property="Background" Value="{DynamicResource ButtonHighlightedBackground}" />
                            <Setter Property="Foreground" Value="{DynamicResource TextHighlighted}" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="#FF707070"/>
                            <Setter Property="Fill" TargetName="GlyphPanel" Value="#FF707070"/>
                        </Trigger>
                        <Trigger Property="CanContentScroll" SourceName="SubMenuScrollViewer" Value="False">
                            <Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset, ElementName=SubMenuScrollViewer}"/>
                            <Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset, ElementName=SubMenuScrollViewer}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>