You can set the labels so that they do not have a border on each side, for example
<Label Grid.Row="0" Grid.Column="0" BorderBrush="Black" BorderThickness="0,0,1,1" /> <Label Grid.Row="1" Grid.Column="0" BorderBrush="Black" BorderThickness="0,1,1,0"/> <Label Grid.Row="0" Grid.Column="1" BorderBrush="Black" BorderThickness="1,0,0,1"/> <Label Grid.Row="1" Grid.Column="1" BorderBrush="Black" BorderThickness="1,1,0,0"/>
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