wpf控件上移下移，调整子集控件显示顺序

页面代码：

<!-- 导出A2，自定义导出设置列，添加时间：2023-8-9 14:14:18，作者：whl；  -->

<Window x:Class="WpfSnqkGasAnalysis.WindowGasExportA2"
        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:WpfSnqkGasAnalysis"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        FontSize="16"
        Title="导出A2，自定义导出设置列" Height="744" Width="800">
    <Window.Resources>
        <Style TargetType="Button" x:Key="sel_button">
            <Setter Property="Margin" Value="13,2"></Setter>
            <Setter Property="Padding" Value="10,2"></Setter>
            <Setter Property="FontSize" Value="16"></Setter>
            <Setter Property="HorizontalContentAlignment" Value="Left"></Setter>
        </Style>
        <Style TargetType="Border" x:Key="boder_order">
            <Setter Property="MinWidth" Value="233"></Setter>
            <!--<Setter Property="BorderBrush" Value="Lime"></Setter>
            <Setter Property="BorderThickness" Value="2"></Setter>-->
            <Setter Property="Margin" Value="20,2"></Setter>
            <Style.Resources>
                <Style TargetType="Label">
                    <Setter Property="FontSize" Value="16"></Setter>
                </Style>
                <Style TargetType="TextBox">
                    <Setter Property="FontSize" Value="16"></Setter>
                </Style>
            </Style.Resources>
        </Style>
        
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="70"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0"  >
            <Border BorderBrush="Gold" BorderThickness="0,0,0,1" >
                <Grid>
                <Label   HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top">注意：请先点击左侧需要导出的字段，以作为导出列</Label>
                <TextBlock HorizontalAlignment="Left" Margin="70,44,0,0" TextWrapping="Wrap" FontWeight="Bold" Text="勾选导出列" VerticalAlignment="Top" RenderTransformOrigin="0.952,0.48"/>
                    <TextBlock HorizontalAlignment="Left" Margin="376,44,0,0" TextWrapping="Wrap"  FontWeight="Bold" Text="已勾选的导出列" VerticalAlignment="Top"/>
                </Grid>
            </Border>
          
        </Grid>
        <Grid Grid.Row="1">
            <Grid  ShowGridLines="True"  >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="284"    ></ColumnDefinition>
                    <ColumnDefinition Width="*"   ></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <ScrollViewer Grid.Column="0" VerticalScrollBarVisibility="Auto"   >
                    <StackPanel     x:Name="leftFields" Orientation="Vertical"  Background="#FFFFFF"    >

                        <Button Content="样品编号"   Tag="k338_sample_no" Style="{ 
        StaticResource sel_button}" />
                        <Button Content="井号"   Tag="k338_well_no" Style="{ 
        StaticResource sel_button}"  />
                        <Button Content="类别"   Tag="k338_cate" Style="