wpf 可调大小的子窗口

这里介绍一个可以调节子窗口大小的例子：

<Window x:Class="EdiltPush.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition MinHeight="0"></RowDefinition>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition MinHeight="0"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" MinWidth="30"></ColumnDefinition>
            <ColumnDefinition Width="auto" MinWidth="10"></ColumnDefinition>
            <ColumnDefinition Width="*" MinWidth="20"></ColumnDefinition>
            <ColumnDefinition Width="auto" MinWidth="10"></ColumnDefinition>
            <ColumnDefinition Width="*" MinWidth="10"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <TextBox Text="Hello world." Grid.Row="0" Grid.Column="0" Margin="3"></TextBox>
        <Button Content="button" Grid.Row="0" Grid.Column="2" Margin="3"></Button>
        <TextBox Text=" text box" Grid.Row="0" Grid.Column="4" Margin="3"></TextBox>
        <Button Content="button" Grid.Row="2" Grid.Column="0" Margin="3"></Button>
        <TextBox Text="This is a text box" Grid.Row="2" Grid.Column="2" Margin="3"></TextBox>
        <Button Content="button" Grid.Row="2" Grid.Column="4" Margin="3"></Button>
        <GridSplitter Grid.Column="1" Grid.RowSpan="3" Width="8" VerticalAlignment="Stretch" HorizontalAlignment="Center"></GridSplitter>
        <GridSplitter Grid.Column="3" Grid.RowSpan="3" Width="8" VerticalAlignment="Stretch" HorizontalAlignment="Center"></GridSplitter>
        <GridSplitter Grid.Row="1" Grid.ColumnSpan="5" Height="4" HorizontalAlignment="Stretch" VerticalAlignment="Center"></GridSplitter>
    </Grid>
</Window>