我设法通过使用这种样式完全删除按钮边框
<Style x:Key="TransparentStyle" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Background="Transparent">
<ContentPresenter/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
但是,如何去除 TAB 键出现的黑色虚线边框呢?