HandyControl 使用 HandyControl 组件之后， Button 按钮在 xaml 设计器中现实异常问题

Describe the bug

Button 布局 - 全部填充模式失效

<Window x:Class="AppTest.MainWindow"
        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"
        Height="450" Width="800"  TextElement.FontWeight="Medium" TextElement.FontSize="14" Foreground="LightGray" FontFamily="Microsoft YaHei" 
        WindowStartupLocation="CenterScreen"  ShowInTaskbar="True" HorizontalAlignment="Center"  ResizeMode="NoResize"
        Title="PaperWeight System" WindowStyle="None">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30*"/>
            <RowDefinition Height="30*"/>
            <RowDefinition Height="40*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="10*"/>
            <ColumnDefinition Width="10*"/>
        </Grid.ColumnDefinitions>

        <Button Grid.Column="0" Name="BtnPrint" Grid.Row="0" Content="标签打印" FontSize="30" FontWeight="DemiBold"  HorizontalAlignment="Stretch" Height="Auto" VerticalAlignment="Stretch" Margin="5" 
                       Foreground="White" Background="BlueViolet"/>
        <Button Grid.Column="1" Name="BtnLable" Grid.Row="0" Content="标签设置" FontSize="30" FontWeight="DemiBold" HorizontalAlignment="Stretch" Height="Auto" VerticalAlignment="Stretch" Margin="5"
                       Foreground="White" Background="BlueViolet"/>
        <Button Grid.Column="0" Name="BtnChooseTeam" Grid.Row="1" Content="选择班组" FontSize="30" FontWeight="DemiBold"  HorizontalAlignment="Stretch" Height="Auto" VerticalAlignment="Stretch" Margin="5"
                       Foreground="White" Background="BlueViolet"/>
        <Button Grid.Column="1" Name="BtnChoosePlan" Grid.Row="1" Content="选择工单" FontSize="30" FontWeight="DemiBold"  HorizontalAlignment="Stretch" Height="Auto" VerticalAlignment="Stretch" Margin="5"
                       Foreground="White" Background="BlueViolet"/>
        <Button Grid.Column="0" Name="BtnProcess"  Grid.Row="2"  Grid.ColumnSpan="2" Content="收纸称重" FontSize="30" FontWeight="DemiBold"  
                HorizontalAlignment="Stretch" Height="Auto" VerticalAlignment="Stretch" Margin="5" Foreground="White" Background="BlueViolet"/>
    </Grid>
</Window>