Шаблон находится на странице, на которую вы ссылаетесь.Или хотя бы английская версия.Вот кнопка меню:
<Style x:Key="MenuScrollButton" BasedOn="{x:Null}" TargetType="{x:Type RepeatButton}">
<Setter Property="ClickMode" Value="Hover"/>
<Setter Property="MinWidth" Value="0"/>
<Setter Property="MinHeight" Value="0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type RepeatButton}">
<DockPanel Background="Transparent" SnapsToDevicePixels="true">
<Rectangle x:Name="R1" DockPanel.Dock="Right" Fill="Transparent" Width="1"/>
<Rectangle x:Name="B1" DockPanel.Dock="Bottom" Fill="Transparent" Height="1"/>
<Rectangle x:Name="L1" DockPanel.Dock="Left" Fill="Transparent" Width="1"/>
<Rectangle x:Name="T1" DockPanel.Dock="Top" Fill="Transparent" Height="1"/>
<ContentPresenter x:Name="ContentContainer" HorizontalAlignment="Center" Margin="2,2,2,2" VerticalAlignment="Center"/>
</DockPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="true">
<Setter Property="Fill" TargetName="R1" Value="{DynamicResource {x:Static SystemColors.ControlLightLightBrushKey}}"/>
<Setter Property="Fill" TargetName="B1" Value="{DynamicResource {x:Static SystemColors.ControlLightLightBrushKey}}"/>
<Setter Property="Fill" TargetName="L1" Value="{DynamicResource {x:Static SystemColors.ControlDarkDarkBrushKey}}"/>
<Setter Property="Fill" TargetName="T1" Value="{DynamicResource {x:Static SystemColors.ControlDarkDarkBrushKey}}"/>
<Setter Property="Margin" TargetName="ContentContainer" Value="3,3,1,1"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Для всех извлеченных шаблонов см .:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/41ad0250-d0f9-4a24-b668-35020f0cfdf9/wpf-menu-customization?forum=wpf