[WPF]拖拽改变区域大小

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<Window x:Class="WPFTest.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="MainWindow" Height="Auto" Width="Auto">    <Grid>        <Grid.RowDefinitions>            <RowDefinition Height="*"/>        </Grid.RowDefinitions>        <Grid.ColumnDefinitions>            <ColumnDefinition Width="Auto"/>            <ColumnDefinition Width="Auto"/>            <ColumnDefinition Width="*"/>        </Grid.ColumnDefinitions>        <DockPanel Grid.Row="0" Grid.Column="0">            <TreeView>                <TreeViewItem Header="A00">                    <TreeViewItem Header="A01"/>                    <TreeViewItem Header="A02"/>                    <TreeViewItem Header="A03"/>                    <TreeViewItem Header="A04"/>                </TreeViewItem>                <TreeViewItem Header="B00">                    <TreeViewItem Header="B01"/>                    <TreeViewItem Header="B02"/>                    <TreeViewItem Header="B03"/>                    <TreeViewItem Header="B04"/>                </TreeViewItem>                <TreeViewItem Header="C00">                    <TreeViewItem Header="C01"/>                    <TreeViewItem Header="C02"/>                    <TreeViewItem Header="C03"/>                    <TreeViewItem Header="C04"/>                </TreeViewItem>                <TreeViewItem Header="D00">                    <TreeViewItem Header="D01"/>                    <TreeViewItem Header="D02"/>                    <TreeViewItem Header="D03"/>                    <TreeViewItem Header="D04"/>                </TreeViewItem>            </TreeView>        </DockPanel>        <GridSplitter Grid.Row="0" Grid.Column="1" Width="3" Margin="2,0,2,0" Background="Purple"                      VerticalAlignment="Stretch" HorizontalAlignment="Center"/>        <DockPanel Grid.Row="0" Grid.Column="2">            <ListView>                <ListViewItem>E00</ListViewItem>                <ListViewItem>F00</ListViewItem>                <ListViewItem>G00</ListViewItem>                <ListViewItem>H00</ListViewItem>                <ListViewItem>I00</ListViewItem>                <ListViewItem>J00</ListViewItem>                <ListViewItem>K00</ListViewItem>                <ListViewItem>L00</ListViewItem>            </ListView>        </DockPanel>    </Grid></Window>
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