设置控件的相对布局位置不变

在背景图上写控件时，控制所写控件的相对布局不变，WPF 控件的相对布局启动：
未按等比例设置的放大效果，可以看出我们事先绘制的红色框线已经偏离原先在内的Button
按等比例缩放效果：
可以看出，等比例缩放效果，是一直红色框线和Butong的位置保持相对不变未按等比例缩放<Window x:Class="WpfApp1.Window3"
        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:WpfApp1"
        mc:Ignorable="d"
        Title="Window3" Height="350" Width="560" WindowStyle="None" ResizeMode="NoResize">
    <Grid>
        <Grid.Background>
            <ImageBrush ImageSource="bg.png"/>
        </Grid.Background>
        <Button Content="Button" HorizontalAlignment="Left" Margin="402,249,0,0" VerticalAlignment="Top" Width="62" RenderTransformOrigin="0.471,0.289" Height="24"/>
        <Button Content="最大化" Click="Button_Click" HorizontalAlignment="Left" Margin="87,142,0,0" VerticalAlignment="Top" Width="75"/>
        <Button Content="等比例缩放窗口" Click="Button_Click_1" HorizontalAlignment="Left" Margin="87,221,0,0" VerticalAlignment="Top" Width="104" Height="29"/>

    </Grid>
</Window>
等比例缩放：<Window x:Class="WpfApp1.Window4"
        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:WpfApp1"
        mc:Ignorable="d"
        Title="Window3" Height="350" Width="560" WindowStyle="None" ResizeMode="NoResize">
    <Grid>
        <Grid.Background>
            <ImageBrush ImageSource="bg.png"/>
        </Grid.Background>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="450*"></ColumnDefinition>
            <ColumnDefinition Width="80*"></ColumnDefinition>
            <ColumnDefinition Width="100*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="760*"></RowDefinition>
            <RowDefinition Height="100*"></RowDefinition>
            <RowDefinition Height="230*"></RowDefinition>
        </Grid.RowDefinitions>
        <Button Content="Button" Grid.Column="1" Grid.Row="1" Margin="5"/>
        <Button Content="最大化" Click="Button_Click" HorizontalAlignment="Left" Margin="87,142,0,0" VerticalAlignment="Top" Width="75"/>

    </Grid>
</Window>