WPF 按键仅显示一部分呢?

<Window x:Class="TestCom.BtnWpf"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:TestCom"
mc:Ignorable="d"
Title="按键" Height="450" Width="800">
<Window.Resources>
<Style x:Key="MyButtonStyle" TargetType="Button">
<Setter Property="Width" Value="140"/>
<Setter Property="Height" Value="40"/>
<Setter Property="Background" Value="Orange"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="FontSize" Value="16"/>
<Setter Property="Padding" Value="10"/>
</Style>
</Window.Resources>
<Grid >
<Button x:Name="button" Content="按钮定义" FontSize="20" Width="100" Height="40" Background="LightBlue" Foreground="White" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Click="button_Click"/>
<Button x:Name="btnStyle" Content=" Style Button" Style="{StaticResource MyButtonStyle }" Margin="10,63,650,332" VerticalAlignment="Top" ></Button>
<Label Content="Name:" Target="{Binding ElementName=txtName}" FontSize="12" Foreground="White" Background="MediumOrchid" Width="70" Margin="338,10,392,394" HorizontalAlignment="Center" VerticalAlignment="Center" HorizontalContentAlignment="Center" VerticalContentAlignment="Center"/>
<TextBox x:Name="txtName" Width="200" Height="24" Margin="422,13,178,398"></TextBox>
<Label x:Name="label" Content="Label" HorizontalAlignment="Left" Margin="338,58,0,0" VerticalAlignment="Top"/>
<TextBox x:Name="textBox" HorizontalAlignment="Left" Margin="422,58,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
</Grid>
</Window>