WPF GridSplitter上下左右拖動

<Window x:Class="testGridSplitter.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>
<Grid.RowDefinitions >
<RowDefinition Height="60" MinHeight="60"/>
<RowDefinition MinHeight="60"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" MinWidth="60" MaxWidth="400"/>
<ColumnDefinition MinWidth="60"/>
</Grid.ColumnDefinitions>

　　　　 <GridSplitter Width="5" Grid.Row="0" Grid.RowSpan="2" Grid.Column="0" Background="Gray"  HorizontalAlignment="Right"/>
　　　　 <GridSplitter Height="5" Grid.Row="0" Grid.Column="1" Background="Gray" HorizontalAlignment="Stretch" VerticalAlignment="Bottom"/>

</Grid>
</Window>