aistudio-wpf-diagram/Extensions/AIStudio.Wpf.Mind/Styles/ContextMenu.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:options="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options">

    <DropShadowEffect x:Key="DropShadowEffectStyle"
                      x:Shared="False"
                      BlurRadius="4"
                      Direction="315"
                      Opacity="0.3"
                      ShadowDepth="2"
                      Color="Black"
                      options:Freeze="True" />
    
    <Style x:Key="ContextMenuStyle" TargetType="{x:Type ContextMenu}">
        <Setter Property="Background" Value="White" />
        <Setter Property="Block.TextAlignment" Value="Left" />
        <Setter Property="BorderBrush" Value="LightGray" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Foreground" Value="Black" />
        <Setter Property="Grid.IsSharedSizeScope" Value="True" />
        <Setter Property="HasDropShadow" Value="True" />
        <Setter Property="HorizontalContentAlignment" Value="Left" />
        <Setter Property="OverridesDefaultStyle" Value="True" />
        <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ContextMenu}">
                    <Border x:Name="Border"
                                    Width="{TemplateBinding Width}"
                                    Height="{TemplateBinding Height}"
                                    Padding="{TemplateBinding Padding}"
                                    Background="{TemplateBinding Background}"
                                    BorderBrush="{TemplateBinding BorderBrush}"
                                    BorderThickness="{TemplateBinding BorderThickness}"
                                    CornerRadius="3"
                                    SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">

                        <ScrollViewer x:Name="SubMenuScrollViewer"
                                      CanContentScroll="True">
                            <ItemsPresenter x:Name="ItemsPresenter"
                                            Margin="0"
                                            Grid.IsSharedSizeScope="True"
                                            KeyboardNavigation.DirectionalNavigation="Cycle"
                                            KeyboardNavigation.TabNavigation="Cycle"
                                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                        </ScrollViewer>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="HasDropShadow" Value="True">
                            <Setter TargetName="Border" Property="Effect" Value="{StaticResource DropShadowEffectStyle}" />
                            <Setter TargetName="Border" Property="Margin" Value="0 0 6 6" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="TextOptions.TextFormattingMode" Value="Ideal" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
    </Style>
</ResourceDictionary>