大佬们这是什么情况?为啥我放在图标底下能触发背景变色，怎么放在图标上却不会变色呢?

<Style TargetType="Button" x:Key="BBA">
<Setter Property="MinHeight" Value="30"/>
<Setter Property="MinWidth" Value="30"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Foreground" Value="Black"/>
<Setter Property="FontSize" Value="14"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="FontFamily" Value="pack://application:,,,/Fonts/#FontAwesome"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border x:Name="Bd" Background="{TemplateBinding Background}" MinHeight="{TemplateBinding MinHeight}" MinWidth="{TemplateBinding MinWidth}"
SnapsToDevicePixels="true" Margin="5 0 5 0" CornerRadius="5" VerticalAlignment="Center">
<TextBlock x:Name="text" Text="{TemplateBinding Content}" Margin="3,2" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="MediumPurple" TargetName="Bd"/>
<Setter Property="Foreground" Value="White"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background" Value="Purple" TargetName="Bd"/>
<Setter Property="Foreground" Value="White"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

问题解决了，是WindowChrome导致的

做的啥系统