7.Grid面板

<Grid ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" Grid.Row="0">Top Left</Button>
        <Button Grid.Column="1" Grid.Row="0">Meddle center</Button>
        <Button Grid.Column="1" Grid.Row="1">Bottom Meddle</Button>
        <Button Grid.Column="2" Grid.Row="1">Meddle Right</Button>
    </Grid>

  <Grid ShowGridLines="True" UseLayoutRounding="True">
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" Grid.Row="0" >Top Left</Button>
        <Button Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="2">Meddle center</Button>
        <Button Grid.Column="1" Grid.Row="1">Bottom Meddle</Button>
        <Button Grid.Column="2" Grid.Row="1">Meddle Right</Button>
    </Grid>

 <Grid  UseLayoutRounding="True">
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition Width="auto"></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" Grid.Row="0" >Top Left</Button>
        <Button Grid.Column="2" Grid.Row="0" Grid.ColumnSpan="2">Meddle center</Button>
        <GridSplitter Grid.Row="0" Grid.Column="1" Grid.RowSpan="2" Width="3" HorizontalAlignment="Center" VerticalAlignment="Stretch" ShowsPreview="False"></GridSplitter>
        <Button Grid.Column="2" Grid.Row="1">Bottom Meddle</Button>
        <Button Grid.Column="3" Grid.Row="1" >Meddle Right</Button>
    </Grid>