如何创建按钮单击现代窗口主题页面。这是现代的窗口：
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:modernui="clr-namespace:FirstFloor.ModernUI"
xmlns:controls="clr-namespace:FirstFloor.ModernUI.Windows.Controls"
xmlns:navigation="clr-namespace:FirstFloor.ModernUI.Windows.Navigation">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/Button.xaml" />
<ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/Converters.xaml" />
<ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/TextBlock.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style TargetType="controls:ModernWindow">
<Setter Property="BackgroundContent" Value="{DynamicResource WindowBackgroundContent}" />
<Setter Property="FontFamily" Value="{DynamicResource DefaultFontFamily}" />
<Setter Property="FontSize" Value="{DynamicResource DefaultFontSize}" />
<Setter Property="Foreground" Value="{DynamicResource WindowText}" />
<Setter Property="BorderBrush" Value="{DynamicResource WindowBorder}" />
<Setter Property="Width" Value="800" />
<Setter Property="Height" Value="640" />
<Setter Property="MinWidth" Value="320" />
<Setter Property="MinHeight" Value="320" />
<Setter Property="ResizeMode" Value="CanResizeWithGrip" />
<Setter Property="UseLayoutRounding" Value="True" />
<Setter Property="TextOptions.TextFormattingMode" Value="Display" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="controls:ModernWindow">
<Border x:Name="WindowBorder" Margin="{Binding Source={x:Static SystemParameters.WindowNonClientFrameThickness}}">
<Border.Background>
<SolidColorBrush x:Name="WindowBorderBackground" Color="{DynamicResource WindowBackgroundColor}" />
</Border.Background>
<Border.Resources>
<Storyboard x:Key="BackgroundAnimation">
<ColorAnimation Storyboard.TargetName="WindowBorderBackground" Storyboard.TargetProperty="Color" To="{DynamicResource WindowBackgroundColor}" Duration="0:0:.6" />
</Storyboard>
</Border.Resources>
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1">
<AdornerDecorator>
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="36" />
<RowDefinition Height="40" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<!-- window background content -->
<ContentControl Grid.RowSpan="5" Content="{TemplateBinding BackgroundContent}" />
<!-- title bar -->
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="96" />
</Grid.ColumnDefinitions>
<!-- title -->
<TextBlock Text="{TemplateBinding Title}" Margin="8,0" VerticalAlignment="Center" Style="{StaticResource ModernWindowTitle}"
DataContext="{TemplateBinding IsTitleVisible}"
Visibility="{Binding Converter={StaticResource BooleanToVisibilityConverter}}"/>
<!-- title links -->
<ItemsControl Grid.Column="1" ItemsSource="{TemplateBinding TitleLinks}" Margin="0,0,24,0" WindowChrome.IsHitTestVisibleInChrome="True">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Line x:Name="Separator" X1=".5" Y1="3" X2=".5" Y2="12" Margin="5,0" VerticalAlignment="Center" Stroke="{DynamicResource SeparatorBackground}" />
<Button Content="{Binding DisplayName}"
Command="navigation:LinkCommands.NavigateLink"
CommandParameter="{Binding Source}"
CommandTarget="{Binding ElementName=ContentFrame}"
Style="{StaticResource SystemButtonLink}" />
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource PreviousData}}" Value="{x:Null}">
<Setter Property="Visibility" TargetName="Separator" Value="Collapsed"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<!-- userName -->
<TextBlock Grid.Column="2" Text="{Binding Converter={StaticResource ToUpperConverter}}" FontFamily="Segoe UI" FontSize="11" VerticalAlignment="Center"
DataContext="{TemplateBinding AuthUserName}" />
<!-- logo (visible only when LogoData is not null) -->
<Border Grid.Column="3" Background="{DynamicResource Accent}" Width="36" Height="36" Margin="8,0"
DataContext="{TemplateBinding LogoData}"
Visibility="{Binding Converter={StaticResource NullToVisibilityConverter}, ConverterParameter=inverse}">
<Path Data="{Binding}" Stretch="Fill" Fill="White" Width="24" Height="24" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Border>
<!-- window system buttons-->
<StackPanel Grid.Column="4" Orientation="Horizontal" VerticalAlignment="Top" WindowChrome.IsHitTestVisibleInChrome="True">
<Button Command="{Binding Source={x:Static SystemCommands.MinimizeWindowCommand}}" ToolTip="{x:Static modernui:Resources.Minimize}" Style="{StaticResource SystemButton}">
<Button.Content>
<Grid Width="13" Height="12" RenderTransform="1,0,0,1,0,1">
<Path Data="M0,6 L8,6 Z" Width="8" Height="7" VerticalAlignment="Center" HorizontalAlignment="Center"
Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="2" />
</Grid>
</Button.Content>
</Button>
<Grid Margin="1,0,1,0">
<Button x:Name="Restore" Command="{Binding Source={x:Static SystemCommands.RestoreWindowCommand}}" ToolTip="{x:Static modernui:Resources.Restore}" Style="{StaticResource SystemButton}" Visibility="Collapsed" >
<Button.Content>
<Grid Width="13" Height="12" UseLayoutRounding="True" RenderTransform="1,0,0,1,.5,.5">
<Path Data="M2,0 L8,0 L8,6 M0,3 L6,3 M0,2 L6,2 L6,8 L0,8 Z" Width="8" Height="8" VerticalAlignment="Center" HorizontalAlignment="Center"
Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="1" />
</Grid>
</Button.Content>
</Button>
<Button x:Name="Maximize" Command="{Binding Source={x:Static SystemCommands.MaximizeWindowCommand}}" ToolTip="{x:Static modernui:Resources.Maximize}" Style="{StaticResource SystemButton}" >
<Button.Content>
<Grid Width="13" Height="12">
<Path Data="M0,1 L9,1 L9,8 L0,8 Z" Width="9" Height="8" VerticalAlignment="Center" HorizontalAlignment="Center"
Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="2" />
</Grid>
</Button.Content>
</Button>
</Grid>
<Button Command="{Binding Source={x:Static SystemCommands.CloseWindowCommand}}" ToolTip="{x:Static modernui:Resources.Close}" Style="{StaticResource SystemCloseButton}" >
<Button.Content>
<Grid Width="13" Height="12" RenderTransform="1,0,0,1,0,1">
<Path Data="M0,0 L8,7 M8,0 L0,7 Z" Width="8" Height="7" VerticalAlignment="Center" HorizontalAlignment="Center"
Stroke="{Binding Foreground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" StrokeThickness="1.5" />
</Grid>
</Button.Content>
</Button>
</StackPanel>
</Grid>
<!--<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="42" />
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
--><!-- back button --><!--
<controls:ModernButton Margin="8,10,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"
EllipseDiameter="24" IconWidth="12" IconHeight="12"
IconData="F1 M 33,22L 33,26L 19.75,26L 27,33L 20.5,33L 11,24L 20.5,15L 27,15L 19.75,22L 33,22 Z"
Command="NavigationCommands.BrowseBack"
CommandTarget="{Binding ElementName=ContentFrame}"
ToolTip="{x:Static modernui:Resources.Back}"
WindowChrome.IsHitTestVisibleInChrome="True" />
--><!-- main menu --><!--
<controls:ModernMenu Grid.Column="1"
SelectedSource="{Binding Source, ElementName=ContentFrame, Mode=TwoWay}"
LinkGroups="{TemplateBinding MenuLinkGroups}" />
</Grid>-->
<!-- content frame -->
<controls:ModernFrame x:Name="ContentFrame" KeepContentAlive="False" Grid.Row="1" Grid.RowSpan="2" Margin="3,3,3,3" Source="{Binding ContentSource, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" ContentLoader="{TemplateBinding ContentLoader}"/>
<!-- resize grip -->
<Grid Grid.Row="2" x:Name="ResizeGrip" Background="Transparent" Visibility="Collapsed" HorizontalAlignment="Right" VerticalAlignment="Bottom" WindowChrome.ResizeGripDirection="BottomRight">
<Path Width="12" Height="12" Margin="1"
Stroke="{DynamicResource WindowText}"
StrokeThickness="1"
Stretch="None"
Data="F1 M1,10 L3,10 M5,10 L7,10 M9,10 L11,10 M2,9 L2,11 M6,9 L6,11 M10,9 L10,11 M5,6 L7,6 M9,6 L11,6 M6,5 L6,7 M10,5 L10,7 M9,2 L11,2 M10,1 L10,3" />
</Grid>
</Grid>
</AdornerDecorator>
</Border>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsActive" Value="True">
<Setter Property="BorderBrush" Value="{DynamicResource WindowBorderActive}" />
</Trigger>
<Trigger Property="WindowState" Value="Maximized">
<Setter TargetName="Maximize" Property="Visibility" Value="Collapsed" />
<Setter TargetName="Restore" Property="Visibility" Value="Visible" />
<Setter TargetName="LayoutRoot" Property="Margin" Value="7" />
</Trigger>
<Trigger Property="WindowState" Value="Normal">
<Setter TargetName="Maximize" Property="Visibility" Value="Visible" />
<Setter TargetName="Restore" Property="Visibility" Value="Collapsed" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="ResizeMode" Value="CanResizeWithGrip" />
<Condition Property="WindowState" Value="Normal" />
</MultiTrigger.Conditions>
<Setter TargetName="ResizeGrip" Property="Visibility" Value="Visible" />
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="WindowChrome.WindowChrome">
<Setter.Value>
<WindowChrome CornerRadius="0" GlassFrameThickness="1" UseAeroCaptionButtons="False" NonClientFrameEdges="None" />
</Setter.Value>
</Setter>
</Style>
我们需要按下现代窗口的顶部标题，然后单击或命令按钮。我想对这个命令做一些实现。如何在这指挥？