绑定在XAML中不能一致地工作

Question

对于在样式下指定的模板中的边框：

<Thickness x:Key="CommonBorderThickness">2</Thickness>
<Style x:Key="CommonButtonStyle" TargetType="Button">
...
   <Setter Property="BorderThickness" Value="2" />
...
   <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="Button">
...
                         <Border Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="0" Grid.RowSpan="2"

这很好用：

BorderThickness="{Binding Source={StaticResource CommonBorderThickness}, Converter={StaticResource FourGroupSizeConverter}}"

但这些不是：

BorderThickness="{TemplateBinding BorderThickness, Converter={StaticResource FourGroupSizeConverter}}"
BorderThickness="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BorderThickness, Converter={StaticResource FourGroupSizeConverter}}" 

关于为什么的任何想法？