Problem setting Foreground with Visual State Manager

Question

I have a WPF application, and I am attempting to style a TextBox using the .Net v4 Visual State Manager. Specifically, I am attempting to set the colors of the Foreground and Background for the MouseOver state.

What is happening is that, while the background and border are changing perfectly, the foreground is not. If the brushes that I am using get their color via a StaticResource, then the foreground does not change at all. If the brushes that I am using get their color via a DynamicResource, then when I mouse over a TextBox, the foreground of all TextBoxes change. Clearly, either I'm doing something wrong, or what I want to do is simply not possible with VSM (which would be rather disappointing).

Here are the resources that I am using:

<Color x:Key="ControlBackgroundColor" R="178" G="178" B="178" A="255" />
<Color x:Key="ControlForegroundColor" R="0" G="0" B="0" A="255" />
<Color x:Key="BorderColor" R="127" G="127" B="127" A="255" />
<Color x:Key="MouseOverControlBackgroundColor" R="0" G="0" B="0" A="255" />
<Color x:Key="MouseOverControlForegroundColor" R="255" G="255" B="255" A="255" />
<Color x:Key="MouseOverBorderColor" R="178" G="178" B="178" A="255" />

<SolidColorBrush PresentationOptions:Freeze="True" x:Key="ControlBackgroundBrush" Color="{DynamicResource ControlBackgroundColor}" />
<SolidColorBrush PresentationOptions:Freeze="True" x:Key="ControlForegroundBrush" Color="{DynamicResource ControlForegroundColor}" />
<SolidColorBrush PresentationOptions:Freeze="True" x:Key="BorderBrush" Color="{DynamicResource BorderColor}" />

<SolidColorBrush PresentationOptions:Freeze="True" x:Key="MouseOverControlBackgroundBrush" Color="{DynamicResource MouseOverControlBackgroundColor}" />
<SolidColorBrush PresentationOptions:Freeze="True" x:Key="MouseOverControlForegroundBrush" Color="{DynamicResource MouseOverControlForegroundColor}" />
<SolidColorBrush PresentationOptions:Freeze="True" x:Key="MouseOverBorderBrush" Color="{DynamicResource MouseOverBorderColor}" />

<Style TargetType="{x:Type TextBox}" >
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="Padding" Value="2"/>
    <Setter Property="Margin" Value="1" />
    <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}" />
    <Setter Property="Background" Value="{DynamicResource ControlBackgroundBrush}" />
    <Setter Property="Foreground" Value="{DynamicResource ControlForegroundBrush}" />

    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="TextBox">
                <Grid x:Name="RootElement">
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualState x:Name="Normal"/>
                            <VisualState x:Name="MouseOver">
                                <Storyboard>
                                    <ColorAnimation Storyboard.TargetName="MouseOverBorder" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" To="{DynamicResource MouseOverBorderColor}" Duration="0:0:0.3"/>
                                    <ColorAnimation Storyboard.TargetName="MouseOverBorder" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" To="{DynamicResource MouseOverControlBackgroundColor}" Duration="0:0:0.3"/>
                                    <ColorAnimation Storyboard.TargetName="PART_ContentHost" Storyboard.TargetProperty="(Foreground).(SolidColorBrush.Color)" To="{DynamicResource MouseOverControlForegroundColor}" Duration="0:0:0.3"/>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <Border x:Name="Border" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="1" Opacity="1" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}">
                        <Grid x:Name="ContentGrid">
                            <Border x:Name="MouseOverBorder" BorderThickness="1" BorderBrush="Transparent" Background="Transparent">
                                <ScrollViewer x:Name="PART_ContentHost" Padding="{TemplateBinding Padding}" Foreground="{TemplateBinding Foreground}" BorderThickness="0" IsTabStop="False"/>
                            </Border>
                        </Grid>
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

It is very odd to me that the background and boarder brushes, which are created and animated in exactly the same way, work perfectly regardless of whether I use Static or Dynamic resources, but that the Foreground color does not.

If anyone has any ideas, or if there is a better way to do this, I'd love to hear it.

David Mullin IMA Technologies