话说这个书无意间看到的，所以就拿来保留一下，说不定会用上。不过看到这么多密密麻麻的有点头大，等什么时候再慢慢看
文章来源，源文有效果图看
http://www.tuxi.com.cn/6-158-1584145.html
代码
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
xmlns:my="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
<!--TreeViewItem-->
<Style TargetType="sdk:TreeViewItem">
<Setter Property="Padding" Value="0"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="HorizontalAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Cursor" Value="Arrow"/>
<Setter Property="IsTabStop" Value="True"/>
<Setter Property="TabNavigation" Value="Once"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="sdk:TreeViewItem">
<StackPanel Background="{x:Null}">
<StackPanel.Resources>
<my:TreeViewItemIndentationConverter x:Key="IndentConverter"/>
</StackPanel.Resources>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<DoubleAnimation Duration="0" Storyboard.TargetName="Hover" Storyboard.TargetProperty="Opacity" To="1" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed"/>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Header" Storyboard.TargetProperty="Foreground" Duration="0">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<SolidColorBrush Color="#FF999999"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Content" Storyboard.TargetProperty="Foreground" Duration="0">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<SolidColorBrush Color="#FF999999"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected"/>
<VisualState x:Name="Selected">
<Storyboard>
<DoubleAnimation Duration="0" Storyboard.TargetName="Selection" Storyboard.TargetProperty="Opacity" To="1"/>
</Storyboard>
</VisualState>
<VisualState x:Name="SelectedInactive">
<Storyboard>
<DoubleAnimation Duration="0" Storyboard.TargetName="Selection" Storyboard.TargetProperty="Opacity" To=".8"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="HasItemsStates">
<VisualState x:Name="HasItems"/>
<VisualState x:Name="NoItems">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ExpanderButton" Storyboard.TargetProperty="Visibility" Duration="0">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ExpansionStates">
<VisualState x:Name="Collapsed"/>
<VisualState x:Name="Expanded">
<Storyboard>
<!--<DoubleAnimation Duration="0:0:0.2" Storyboard.TargetName="ExpandedBackground" Storyboard.TargetProperty="Opacity" To="1" />-->
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="ItemsHost" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0:0:0.21" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="Hover" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0:0:0.21" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border Background="{x:Null}" CornerRadius="2">
<Grid>
<Rectangle x:Name="ExpandedBackground" Stroke="#FFF1F8FC" HorizontalAlignment="Stretch" RadiusX="4" RadiusY="4" IsHitTestVisible="False" Opacity="0" Grid.ColumnSpan="3" Canvas.ZIndex="0">
<Rectangle.Fill>
<LinearGradientBrush StartPoint=".5,0" EndPoint=".5,1">
<GradientStop Offset="-4" Color="#FFB4D2EB" />
<GradientStop Offset="1.4" Color="#FFFFFFFF" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Rectangle x:Name="Hover" Stroke="#FFd8f0ff" StrokeThickness="1" HorizontalAlignment="Stretch" RadiusX="4" RadiusY="4" IsHitTestVisible="False" Opacity="0" Grid.ColumnSpan="3" Canvas.ZIndex="0">
<Rectangle.Fill>
<LinearGradientBrush StartPoint=".5,0" EndPoint=".5,1">
<GradientStop Offset="0" Color="#ffe5f4ff" />
<GradientStop Offset="1" Color="#FFd8f0ff" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Rectangle x:Name="Selection" Stroke="#FFfee69e" HorizontalAlignment="Stretch" RadiusX="4" RadiusY="4" IsHitTestVisible="False" Opacity="0" Grid.ColumnSpan="3" Canvas.ZIndex="0" >
<Rectangle.Fill>
<LinearGradientBrush>
<GradientStop Offset="0" Color="#FFfff2ca" />
<GradientStop Offset="1" Color="#FFfee69e" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Button x:Name="Header" ClickMode="Hover" Width="Auto" Background="{TemplateBinding Background}" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" IsTabStop="False" TabNavigation="Once">
<Button.Template>
<ControlTemplate TargetType="Button">
<Grid Background="{TemplateBinding Background}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="Pressed" />
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Content" Storyboard.TargetProperty="Opacity" Duration="0" To=".55"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter x:Name="Content" Cursor="{TemplateBinding Cursor}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="Left" Margin="{TemplateBinding Padding}"/>
</Grid>
</ControlTemplate>
</Button.Template>
<Button.Content>
<Border BorderThickness="0" Margin="10 0 0 0">
<Grid Margin="{Binding RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource IndentConverter}}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="15"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ToggleButton x:Name="ExpanderButton" HorizontalAlignment="Center" VerticalAlignment="Stretch" IsTabStop="False" TabNavigation="Once">
<ToggleButton.Template>
<ControlTemplate TargetType="ToggleButton">
<Grid x:Name="Root" Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation Storyboard.TargetName="UncheckedVisual" Storyboard.TargetProperty="(Path.Stroke).Color" To="#FF1BBBFA" Duration="0"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To=".7" Duration="0"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="CheckStates">
<VisualState x:Name="Unchecked"/>
<VisualState x:Name="Checked">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="UncheckedVisual" Storyboard.TargetProperty="Opacity" To="0" Duration="0"/>
<DoubleAnimation Storyboard.TargetName="CheckedVisual" Storyboard.TargetProperty="Opacity" To="1" Duration="0"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid HorizontalAlignment="Right" Margin="2 2 5 2">
<Path x:Name="UncheckedVisual" Width="6" Height="9" Fill="#FFFFFFFF" VerticalAlignment="Center" HorizontalAlignment="Right" Data="M 0,0 L 0,9 L 5,4.5 Z" StrokeThickness="1" StrokeLineJoin="Miter">
<Path.Stroke>
<SolidColorBrush Color="#FF989898"/>
</Path.Stroke>
</Path>
<Path x:Name="CheckedVisual" Opacity="0" Width="6" Height="6" Fill="#FF262626" VerticalAlignment="Center" HorizontalAlignment="Center" Data="M 6,0 L 6,6 L 0,6 Z" StrokeLineJoin="Miter"/>
</Grid>
</Grid>
</ControlTemplate>
</ToggleButton.Template>
</ToggleButton>
<ContentControl x:Name="Content" Grid.Column="1" Cursor="{TemplateBinding Cursor}" Foreground="{TemplateBinding Foreground}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Padding="{TemplateBinding Padding}">
<ContentControl.Content>
<ContentPresenter Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}"/>
</ContentControl.Content>
</ContentControl>
</Grid>
</Border>
</Button.Content>
</Button>
</Grid>
</Border>
<Border x:Name="Validation" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="#FFDB000C" CornerRadius="2" Visibility="Collapsed">
<ToolTipService.ToolTip>
<ToolTip x:Name="ValidationToolTip" Placement="Right" PlacementTarget="{Binding ElementName=Content}" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" IsHitTestVisible="True"/>
</ToolTipService.ToolTip>
<Grid Width="10" Height="10" HorizontalAlignment="Right" Margin="0,-4,-4,0" VerticalAlignment="Top" Background="Transparent">
<Path Margin="-1,3,0,0" Fill="#FFDC000C" Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 Z"/>
<Path Margin="-1,3,0,0" Fill="#FFFFFFFF" Data="M 0,0 L2,0 L 8,6 L8,8"/>
</Grid>
</Border>
<ItemsPresenter x:Name="ItemsHost" Visibility="Collapsed"/>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
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