请问如何让下面的lbltA3里的内容在整个单元格中居中。
<Grid Grid.Column="1" Grid.Row="2" x:Name="gtA3" Background="#FF71E426">
<Border BorderThickness="2,2,2,0">
</Border>
<dataInput:Label x:Name="lbltA3" Style="{StaticResource LabelStyle}" Width="75"/>
</Grid>
<Style x:Key="LabelStyle" TargetType="dataInput:Label">
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Margin" Value="0,2,0,2"/>
<Setter Property="FontSize" Value="8"/>
<Setter Property="VerticalAlignment" Value="Center"/>
<Setter Property="HorizontalAlignment" Value="Center"/>
<Setter Property="Height" Value="30"/>
<Setter Property="Width" Value="50"/>
<Setter Property="OpacityMask" Value="Black"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="BorderThickness" Value="1"/>
</Style>