SurfaceScrollBar won't respond to styling - wpf

Question

The application I'm working on has a surfacelistbox whose scrollbar I'm trying to style, but for some reason nothing I'm doing is affecting it.
The style:
<Style TargetType="s:SurfaceScrollBar">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="s:SurfaceScrollBar">
<Grid x:Name="Root">
<Track Margin="2,6,6,6"
Name="PART_Track"
Grid.Row="1"
IsDirectionReversed="true">
<Track.DecreaseRepeatButton>
<s:SurfaceRepeatButton Command="ScrollBar.PageUpCommand" />
</Track.DecreaseRepeatButton>
<Track.Thumb>
<s:SurfaceThumb Width="10"/>
</Track.Thumb>
<Track.IncreaseRepeatButton>
<s:SurfaceRepeatButton Command="ScrollBar.PageDownCommand" />
</Track.IncreaseRepeatButton>
</Track>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="s:SurfaceRepeatButton">
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Focusable" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="s:SurfaceRepeatButton">
<Border Background="Transparent"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type s:SurfaceThumb}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="s:SurfaceThumb">
<Border CornerRadius="5"
Background="DimGray"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I've tried putting this style in app.xaml, in the window's resources, and in the resources of the listbox itself (<s:SurfaceListBox.Resources>), but nothing has any visual effect. However, if I change it to a regular listbox and change the style accordingly (surfaceScrollBar to ScrollBar, etc.), the style is applied fine no matter where I put it, but this breaks touch scrolling.
Am I doing something wrong with the style itself?