WPF ListViewItem Style

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C#

XAML

WPF

I wanted to match my ListViewItem style my my treeview and listbox items, but I can't get the style to take. I've got the following XAML for the style. I set the colors to black in the triggers so that it would be real obvious if I got it to work. I also only included one of the triggers in the interest of brevity. FWIW, this style is in a resource dictionary that contains style overrides for listboxitem and treeviewitem, and both of those seem to work fine.

I also tried adding a setter for OverridesDefaultStyle to True, but that had no effect.

What am I missing?

<Style x:Key="{x:Type ListViewItem}" TargetType="{x:Type ListViewItem}">
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="Padding" Value="2,0" />
    <Setter Property="Template"> 
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListViewItem}">
                <Grid>
                    <Border x:Name="outerBorder" 
                            BorderBrush="{TemplateBinding BorderBrush}" 
                            BorderThickness="{TemplateBinding BorderThickness}" 
                            CornerRadius="2" 
                            SnapsToDevicePixels="true">
                        <Grid>
                        <Border x:Name="innerBorder" 
                                Background="{TemplateBinding Background}" 
                                BorderThickness="1" 
                                CornerRadius="1" 
                                Padding="{TemplateBinding Padding}" 
                                SnapsToDevicePixels="true" />
                        <GridViewRowPresenter VerticalAlignment="{TemplateBinding VerticalContentAlignment}" 
                                                  SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                        </Grid>
                    </Border>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="true">
                        <Setter TargetName="outerBorder" Property="BorderBrush" Value="Black" />
                        <Setter TargetName="innerBorder" Property="Background" Value="Black" />
                        <Setter TargetName="innerBorder" Property="BorderBrush" Value="Black" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter> 
</Style>