1. 定義treeview 展開按鈕(togglebutton)樣式，建立資源:

   <Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
           <Setter Property="Focusable" Value="False"/>
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType
    
   ="ToggleButton">
                       <Grid Width="25" Height="23" SnapsToDevicePixels="True">
                           
                           <Rectangle Width="13" Height="13" 
                       Stroke="#919191" SnapsToDevicePixels="true">
                               <Rectangle.Fill
    
   >
                                   <LinearGradientBrush EndPoint="0.5,2" StartPoint="0.5,0">
                                       <GradientStop Color="White" Offset="0"/>
                                       <GradientStop Color="Silver" Offset="0.5"/>
                                       <
    
   GradientStop Color="LightGray" Offset="1"/>
                                   </LinearGradientBrush>
                               </Rectangle.Fill>
                           </Rectangle>
                          
                           <Rectangle x:Name="ExpandPath" Width="1" 
                       Height="5" Stroke="Black" SnapsToDevicePixels="true"/>
                           
                           <Rectangle Width="5" Height="1" 
                       Stroke="Black" SnapsToDevicePixels="true"/>
                       </Grid>
                       <ControlTemplate.Triggers>
                           <Trigger Property="IsChecked" Value="True">
                               <Setter Property="Visibility"  
                           TargetName="ExpandPath" Value="Collapsed"/>
                           </Trigger>
                       </ControlTemplate.Triggers>
                   </ControlTemplate>
               </Setter.Value>
           </Setter>
       </Style>

    

　　2.　　修改treeviewitem 的controltemplate:

<TreeView.ItemContainerStyle>
                
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type TreeViewItem}">
                                <Grid  >
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition  Width="22"/>
                                        <ColumnDefinition />
                                        
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition/>
                                        <RowDefinition/>
                                    </Grid.RowDefinitions>
                                    <Border Grid.ColumnSpan="2" Margin="-1600,0,0,0"  x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"  SnapsToDevicePixels="true"/>
                                    <ToggleButton  x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                                    <ContentPresenter Grid.Column="1" x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                    <ItemsPresenter  x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>

                                </Grid>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsExpanded" Value="false">
                                        <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
                                    </Trigger>
                                    <Trigger Property="HasItems" Value="false">
                                        <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
                                    </Trigger>
                                    <Trigger Property="IsSelected" Value="true">
                                        <Setter Property="Background" TargetName="Bd" Value="#FF404040" />

                                        <Setter Property="Background" TargetName="Expander" Value="#FF404040"/>
                                    </Trigger>
                                    <MultiTrigger>
                                        <MultiTrigger.Conditions>
                                            <Condition Property="IsSelected" Value="true"/>
                                            <Condition Property="IsSelectionActive" Value="false"/>
                                        </MultiTrigger.Conditions>
                                        <Setter Property="Background" TargetName="Bd" Value="#FF404040"/>

                                        <Setter Property="Background" TargetName="Expander" Value="#FF404040"/>
                                    </MultiTrigger>
                                    <Trigger Property="IsEnabled" Value="false">
                                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Setter Property="IsExpanded" Value="{Binding IsExpanded,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"/>
                    <Setter Property="IsSelected" Value="{Binding IsSelected,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"/>
                   
                    
                    <Style.Resources>
                       
                        <!--SelectedItem with focus-->
                        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="LightSkyBlue" Opacity=".5"/>
                        <!--SelectedItem without focus-->
                        <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="LightSkyBlue" Opacity=".5"/>
                    </Style.Resources>
                    
                </Style>
            </TreeView.ItemContainerStyle>

3.　　建立treeviewitem的資料繫結：

<TreeView.ItemTemplate>                
                <HierarchicalDataTemplate ItemsSource="{Binding SubGroups}">
                    <StackPanel PreviewMouseLeftButtonDown="StackPanel_PreviewMouseLeftButtonDown" Orientation="Horizontal"  AllowDrop="True" 
                                 DragLeave="StackPanel_DragLeave" DragEnter="StackPanel_DragEnter"
                                 Drop="StackPanel_Drop" MouseLeftButtonDown="StackPanel_MouseLeftButtonDown"  
                                 ContextMenu="{StaticResource ProtocolTreeMenu}" 
                                 Tag="{Binding DataContext, ElementName=TreeProtocol}"
                                 >
                        
                        <TextBox SelectionBrush="DarkBlue" IsVisibleChanged="TextBox_IsVisibleChanged" Background="Transparent" Text="{Binding Name, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Center" Width="Auto"
                                   Visibility="{Binding IsRenaming, Converter={StaticResource ShowCvt}}" KeyDown="TextBox_KeyDown" LostFocus="TextBox_LostFocus"></TextBox>
                        <StackPanel Orientation="Horizontal" Visibility="{Binding IsRenaming, Converter={StaticResource HideCvt}}">
                            <Image Source="../Res/file.png" Width="20" Height="20" Visibility="{Binding HasItemData, Converter={StaticResource ShowCvt}}"></Image>
                            <Image Source="../Res/dir.png" Width="20" Height="20" Visibility="{Binding IsDir, Converter={StaticResource ShowCvt}}"></Image>
                            <TextBlock Text="{Binding Name}" Margin="5,0"></TextBlock>
                        </StackPanel>
                        
                    </StackPanel>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>

效果: