FPGACoder/HandyControl/HandyControl_Shared/Themes/Styles/Base/ContextMenuBaseStyle.xaml

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

    <Style x:Key="ContextMenuBaseStyle" TargetType="ContextMenu">
        <Setter Property="hc:MenuAttach.ItemPadding" Value="{StaticResource DefaultControlPadding}" />
        <Setter Property="hc:MenuAttach.PopupVerticalOffset" Value="-9" />
        <Setter Property="hc:MenuAttach.PopupHorizontalOffset" Value="10" />
        <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="hc:BorderElement.CornerRadius" Value="{StaticResource DefaultCornerRadius}" />
        <Setter Property="Padding" Value="2,2,2,0" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ContextMenu">
                    <Border Effect="{StaticResource EffectShadow2}" Margin="8" Background="{TemplateBinding Background}" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" MaxHeight="{TemplateBinding MaxHeight}" BorderThickness="1" BorderBrush="{DynamicResource BorderBrush}">
                        <ScrollViewer Style="{StaticResource ScrollViewerUpDown}" Margin="{TemplateBinding Padding}">
                            <ItemsPresenter/>
                        </ScrollViewer>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>