WPF的Label默认的padding不为0

1.如图：

   要求让“Tools” 左对齐，代码中已设置：HorizontalContentAlignment="Left" 

1 <Label Foreground="White" 
2            Content="Tools" 
3            Grid.Column="1" 
4            HorizontalContentAlignment="Left" 
5            VerticalAlignment="Center" 
6            Background="Red"/>                         

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