Customizing HTML disabled attribute in WPF WebPopupMenu (Awesomium)

App.xaml

<Application 
    x:Class="MyWPFSample.App" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:awe="http://schemas.awesomium.com/winfx"
    xmlns:local="clr-namespace:MyWPFSample">
    <Application.Resources>
        <ResourceDictionary>
        
            <!-- MyWebMenuListItem -->
            <Style x:Key="MyWebMenuListItem" TargetType="{x:Type ListBoxItem}">
                <Setter Property="FocusVisualStyle" Value="{x:Null}" />
                <Setter Property="Background" Value="Transparent"/>
                <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
                <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
                <Setter Property="IsSelected" Value="{Binding IsInitialSelection, Mode=OneWay}" />
                <Setter Property="local:WebPopupMenuService.IsItemEnabled" Value="{Binding IsEnabled, Mode=OneWay}" />
                <Setter Property="MinHeight" Value="{Binding DataContext.MenuInfo.ItemHeight, RelativeSource={RelativeSource AncestorType={x:Type ListBox}}}" />
                <Setter Property="BorderThickness" Value="0,1" />
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ListBoxItem}">
                            <Border 
                                x:Name="Bd" 
                                BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" 
                                Background="{TemplateBinding Background}" 
                                Padding="{TemplateBinding Padding}"
                                SnapsToDevicePixels="true">
                                <ContentPresenter 
                                    HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                    SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" 
                                    VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </Border>
                            <ControlTemplate.Triggers>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="True" />
                                        <Condition Binding="{Binding Type}" Value="Option" />
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                    <Setter Property="BorderBrush" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                                    <Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}" />
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="False" />
                                        <Condition Binding="{Binding IsInitialSelection}" Value="True" />
                                        <Condition Binding="{Binding Type}" Value="Option" />
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                                    <Setter Property="BorderBrush" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                                </MultiDataTrigger>
                                <MultiDataTrigger>
                                    <MultiDataTrigger.Conditions>
                                        <Condition Binding="{Binding IsFocused, RelativeSource={RelativeSource Self}}" Value="True" />
                                        <Condition Binding="{Binding Type}" Value="Option" />
                                    </MultiDataTrigger.Conditions>
                                    <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                    <Setter Property="BorderBrush" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                                    <Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}" />
                                </MultiDataTrigger>
                                <Trigger Property="local:WebPopupMenuService.IsItemEnabled" Value="false">
                                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
            
            <!-- WebPopupMenu -->
            <Style TargetType="{x:Type awe:WebPopupMenu}" BasedOn="{StaticResource {x:Type ListBox}}">
                <Setter Property="DataContext" Value="{Binding RelativeSource={RelativeSource Self}}" />
                <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}" />
                <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" />
                <Setter Property="BorderThickness" Value="1" />
                <Setter Property="MaxHeight" Value="{Binding MaxDropDownHeight}" />
                <Setter Property="ItemsSource" Value="{Binding MenuItems}" />
                <Setter Property="Padding" Value="-1" />
                <Setter Property="VerticalAlignment" Value="Stretch" />
                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                <Setter Property="VerticalContentAlignment" Value="Center" />
                <Setter Property="VirtualizingStackPanel.IsVirtualizing" Value="False" />
                <Setter Property="VirtualizingStackPanel.VirtualizationMode" Value="Recycling" />
                <Setter Property="SelectionMode" Value="Extended" />
                <Setter Property="ItemContainerStyle" Value="{StaticResource MyWebMenuListItem}" />
                <Setter Property="Opacity" Value="{Binding PlacementTarget.Opacity}" />
                <Setter Property="StaysOpen" Value="False" />
                <Setter Property="FocusManager.IsFocusScope" Value="True" />
                <Setter Property="DefaultGroupStyle">
                    <Setter.Value>
                        <GroupStyle>
                            <GroupStyle.ContainerStyle>
                                <Style TargetType="{x:Type GroupItem}">
                                    <Setter Property="FontSize" Value="{Binding DataContext.MenuInfo.ItemFontSize, RelativeSource={RelativeSource AncestorType={x:Type ListBox}}}" />
                                    <Setter Property="TextOptions.TextFormattingMode" Value="Display" />
                                    <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled" />
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="{x:Type GroupItem}">
                                                <StackPanel x:Name="groupPanel">
                                                    <TextBlock 
                                                        x:Name="groupLabel" 
                                                        Text="{Binding Name}" 
                                                        VerticalAlignment="Center" 
                                                        Margin="5" 
                                                        MinHeight="{Binding DataContext.MenuInfo.ItemHeight, RelativeSource={RelativeSource AncestorType={x:Type ListBox}}}" 
                                                        FontWeight="Bold"/>
                                                    <ItemsPresenter />
                                                </StackPanel>
                                                <ControlTemplate.Triggers>
                                                    <DataTrigger Binding="{Binding Name}" Value="{x:Null}">
                                                        <Setter TargetName="groupLabel" Property="Visibility" Value="Collapsed" />
                                                        <Setter TargetName="groupPanel" Property="Margin" Value="0" />
                                                    </DataTrigger>
                                                </ControlTemplate.Triggers>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </GroupStyle.ContainerStyle>
                        </GroupStyle>
                    </Setter.Value>
                </Setter>
                <Setter Property="ItemTemplate">
                    <Setter.Value>
                        <DataTemplate DataType="{x:Type core:WebMenuItem}">
                            <TextBlock 
                                x:Name="label" 
                                Text="{Binding Label}" 
                                ToolTip="{Binding ToolTip}" 
                                Margin="0,0,0,2" 
                                VerticalAlignment="Center"/>
                            <DataTemplate.Triggers>
                                <DataTrigger Binding="{Binding Type}" Value="Group">
                                    <Setter TargetName="label" Property="FontWeight" Value="Bold" />
                                </DataTrigger>
                            </DataTemplate.Triggers>
                        </DataTemplate>
                    </Setter.Value>
                </Setter>
            </Style>

        </ResourceDictionary>
    </Application.Resources>
</Application>

WebPopupMenuService.cs

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Collections.Generic;
using System.ComponentModel;

namespace MyWPFSample
{
    public static class WebPopupMenuService
    {
        [AttachedPropertyBrowsableForType( typeof( ListBoxItem ) )]
        public static bool GetIsItemEnabled( ListBoxItem element )
        {
            return (bool)element.GetValue( IsItemEnabledProperty );
        }

        [AttachedPropertyBrowsableForType( typeof( ListBoxItem ) )]
        public static void SetIsItemEnabled( ListBoxItem element, bool value )
        {
            element.SetValue( IsItemEnabledProperty, value );
        }

        public static readonly DependencyProperty IsItemEnabledProperty =
            DependencyProperty.RegisterAttached( "IsItemEnabled",
            typeof( bool ),
            typeof( WebPopupMenuService ), new PropertyMetadata( true ) );
    }
}

using System;
using System.Linq;
using System.Windows;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Controls;

namespace ABContainer
{
public static class WebPopupMenuService
{

    [AttachedPropertyBrowsableForType(typeof(ListBoxItem))]
    public static bool GetIsItemEnabled(ListBoxItem element)
    {
        return (bool)element.GetValue(IsItemEnabledProperty);
    }

    [AttachedPropertyBrowsableForType(typeof(ListBoxItem))]
    public static void SetIsItemEnabled(ListBoxItem element, bool value)
    {
        element.SetValue(IsItemEnabledProperty, value);
    }


    public static readonly DependencyProperty IsItemEnabledProperty =
        DependencyProperty.RegisterAttached( "IsItemEnabled",
        typeof( bool ),
        typeof(WebPopupMenuService), new PropertyMetadata(true));
}

}