Кнопка WPF isPressed и isEnabled проблема

: используя Expression Blend 3

Я пытаюсь стилизовать триггеры свойства IsPressed & IsEnabled (false) для класса кнопок в приложении WPF.

Вот UserControl с кнопкой, использующей стиль ...

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    x:Class="Kiosk.ButtonTest"
    x:Name="UserControl">

    <Grid x:Name="LayoutRoot">
        <Button HorizontalAlignment="Left" Style="{DynamicResource BlueButton}" VerticalAlignment="Top" Width="155" Content="Button" Height="52.9"/>
    </Grid>
</UserControl>

А вот фрагмент стиля ...

   <!-- Blue Button -->
   <Style x:Key="BlueButton" TargetType="{x:Type Button}">
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Background" Value="{DynamicResource BlueGradient3}"/>
        </Trigger>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Background" Value="{DynamicResource DarkGradient1}"/>
            <Setter Property="BorderBrush" Value="{DynamicResource BlueGradient3}"/>
        </Trigger>
        <Trigger Property="IsPressed" Value="True">
            <Setter Property="Background" Value="{DynamicResource DarkGradient1}"/>
            <Setter Property="BorderBrush" Value="{DynamicResource BlueGradient1}"/>
        </Trigger>
    </Style.Triggers>
    <Setter Property="FocusVisualStyle" Value="{StaticResource ButtonFocusVisual}"/>
    <Setter Property="Background" Value="{DynamicResource BlueGradient1}"/>
    <Setter Property="BorderBrush" Value="{DynamicResource BlueGradient2}"/>
    <Setter Property="Foreground" Value="White"/>
    <Setter Property="HorizontalContentAlignment" Value="Center"/>
    <Setter Property="VerticalContentAlignment" Value="Center"/>
    <Setter Property="TextBox.TextAlignment" Value="Center"/>       
    <Setter Property="FontFamily" Value="Trebuchet MS"/>
    <Setter Property="FontSize" Value="18"/>
    <Setter Property="Effect" Value="{DynamicResource KioskStandardDropShadow}" />
</Style>
<LinearGradientBrush x:Key="BlueGradient1" EndPoint="0.5,1" StartPoint="0.5,0">
    <GradientStop Color="#FF3FA2FD" Offset="0"/>
    <GradientStop Color="#FF014782" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush x:Key="BlueGradient2" EndPoint="0.5,1" StartPoint="0.5,0">
    <GradientStop Color="#FF014782" Offset="0"/>
    <GradientStop Color="#FF3FA2FD" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush x:Key="BlueGradient3" EndPoint="0.5,1" StartPoint="0.5,0">
    <GradientStop Color="#FF014782" Offset="1"/>
    <GradientStop Color="#FF0B2135" Offset="0"/>
</LinearGradientBrush>
<LinearGradientBrush x:Key="DarkGradient1" EndPoint="0.5,1" StartPoint="0.5,0">
    <GradientStop Color="#FF2A2A2A" Offset="0"/>
    <GradientStop Color="#FF474747" Offset="0.478"/>
    <GradientStop Color="#FF323232" Offset="0.487"/>
    <GradientStop Color="Black" Offset="1"/>
    <GradientStop Color="#FF282828" Offset="0.681"/>
</LinearGradientBrush>
    <!-- Regular Drop Shadow --> 
    <DropShadowEffect x:Key="KioskStandardDropShadow" Opacity="0.6" BlurRadius="10" ShadowDepth="5" Direction="308"/>
<!-- fragment end -->

Изменения Default и Mouse over работают нормально, но isEnabled false и isPressed true по-прежнему показывают цвета Button по умолчанию.

Что я делаю не так?