XAML - Cannot add border thickness to button when style is applied - wpf

Question

I am trying to add a border thickness to my first navigation button. Normally, you can easily add a BorderThickness to a button but when I add my own style it hides the BorderThickness and BorderBrush. I added a BorderThickness to the style (0,0,0,1) but am not able to have a border thickness of (0,1,0,0) to the first initial button. Any ideas?
<UserControl.Resources>
<Style x:Key="navButtStyle" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
<Border BorderThickness="0,0,0,1" BorderBrush="Black"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Button Style="{StaticResource navButtStyle}"
x:Name="navButton1"
Grid.Row="1"
Content="TR"
Background="#33333D"
FontFamily="Roboto"
FontSize="65"
FontWeight="Bold"
Foreground="White"
BorderBrush="Black"
BorderThickness="0,1,0,0"
HorizontalContentAlignment="Center"
ToolTip="navButton0"
Click="navButton1_Click"
/>
<Button Style="{StaticResource navButtStyle}" x:Name="navButton2" Grid.Row="2" Background="#33333D" ToolTip="navButton2">
<Grid>
<TextBlock Text="󰂯" Padding="30,30,0,0" FontSize="56" FontFamily="Material Design Icons Desktop" Foreground="White"/>
<TextBlock Text="󰖩" Padding="0,0,30,30" FontSize="56" FontFamily="Material Design Icons Desktop" Foreground="White"/>
</Grid>
</Button>
<Button Style="{StaticResource navButtStyle}" x:Name="navButton3" Grid.Row="3" Content="SL" Background="#33333D" FontFamily="Roboto" FontSize="65" FontWeight="Bold" Foreground="White" HorizontalContentAlignment="Center" ToolTip="navButton3" />
Navigation Buttons

Answer 1

property value hardcoded in Template cannot be easily changed from outside. use TemplateBindings instead:
<Style x:Key="navButtStyle" TargetType="Button">
<Setter Property="BorderThickness" Value="0,0,0,1"/>
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
<Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>