关于WPF中DockPanel失效的问题
这是我的代码

XML code

<DockPanel Height="198"  Margin="126,40,0,0" Name="dockPanel1"  Width="303">            <Button DockPanel.Dock="Top" Content="Button" Height="23" Name="button1" Width="75" />        </DockPanel>

按理说按钮应该处于DockPanel控件的上端，但实际上它却处于中间，也就是说DockPanel.Dock="Top" 没有生效，请问这是怎么回事？

[解决办法]
运行下这个看看

XML code

<Window x:Class="WpfApplication1.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="MainWindow" Height="200" Width="500">    <DockPanel>        <Button DockPanel.Dock="Top" Content="Top Button"   Height="23" Name="button1" Width="75"/>        <Button DockPanel.Dock="Bottom" Content="Bottom Button" Height="23" Width="75" />        <Button DockPanel.Dock="Left" Content="Left Button" Height="23"  Width="75" />        <Button DockPanel.Dock="Right" Content="Right Button" Height="23" Width="75"/>    </DockPanel></Window>