3rdpartylibs/fastreports.wpf/Demos/WPF/Main/Controls/ReportsTreeView.xaml

<TreeView x:Class="WpfDemo.ReportsTreeView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfDemo">
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TreeViewItem}">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition/>
                            </Grid.RowDefinitions>
                            <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Opacity="0"/>
                            <ContentPresenter x:Name="PART_Header" ContentSource="Header"/>
                            <ItemsPresenter x:Name="ItemsHost" 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>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.Resources>
        <Geometry x:Key="DownArrow">M 0,0 L 5,5 L 10,0</Geometry>
        <Geometry x:Key="UpArrow">M 0,5 L 5,0 L 10,5</Geometry>
        <HierarchicalDataTemplate DataType="{x:Type local:CategoryItem}" ItemsSource="{Binding Reports}" >
            <Border Background="WhiteSmoke" Height="25" Padding="8,0,7,0" BorderThickness="0,0,0,1" BorderBrush="White" IsHitTestVisible="False">
                <Grid>
                    <Rectangle Width="16" Height="14" HorizontalAlignment="Left" VerticalAlignment="Center">
                        <Rectangle.Fill>
                            <DrawingBrush>
                                <DrawingBrush.Drawing>
                                    <DrawingGroup>
                                        <DrawingGroup.Children>
                                            <GeometryDrawing Brush="#FFF6F6F6" Geometry="F1M1.5,1L9.61,1 10.61,3 13.496,3C14.323,3,14.996,3.673,14.996,4.5L14.996,12.5C14.996,13.327,14.323,14,13.496,14L1.5,14C0.673,14,0,13.327,0,12.5L0,2.5C0,1.673,0.673,1,1.5,1" />
                                            <GeometryDrawing Brush="#FFEFEFF0" Geometry="F1M1.9998,3.0004L1.9998,4.0004 8.8738,4.0004 8.3738,3.0004z" />
                                            <GeometryDrawing Brush="#FFDBB679" Geometry="F1M2,3L8.374,3 8.874,4 2,4z M13.496,4L10,4 9.992,4 8.992,2 1.5,2C1.225,2,1,2.224,1,2.5L1,12.5C1,12.776,1.225,13,1.5,13L13.496,13C13.773,13,13.996,12.776,13.996,12.5L13.996,4.5C13.996,4.224,13.773,4,13.496,4" />
                                        </DrawingGroup.Children>
                                    </DrawingGroup>
                                </DrawingBrush.Drawing>
                            </DrawingBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <TextBlock Text="{Binding Category}" FontSize="12" FontWeight="Bold" VerticalAlignment="Center" Margin="24,0,0,0"/>
                    <Path x:Name="arrow" Data="{StaticResource DownArrow}" HorizontalAlignment="Right" VerticalAlignment="Center" Stroke="DarkGray"/>
                </Grid>
            </Border>
            <HierarchicalDataTemplate.Triggers>
                <DataTrigger Binding="{Binding IsExpanded, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeViewItem}}}" Value="True">
                    <Setter TargetName="arrow" Property="Data" Value="{StaticResource UpArrow}"/>
                </DataTrigger>
            </HierarchicalDataTemplate.Triggers>
        </HierarchicalDataTemplate>
        <DataTemplate DataType="{x:Type local:ReportItem}">
            <Border x:Name="bd" Padding="10,2,10,2" BorderThickness="0,0,0,1" BorderBrush="WhiteSmoke">
                <StackPanel Orientation="Vertical">
                    <TextBlock x:Name="text" Text="{Binding DisplayName}" VerticalAlignment="Center"/>
                    <TextBlock x:Name="tags" Text="{Binding Tags}" VerticalAlignment="Center" FontSize="10" Opacity="0.4"/>
                </StackPanel>
            </Border>
            <DataTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter TargetName="bd" Property="Background" Value="Whitesmoke"/>
                </Trigger>
                <DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeViewItem}}}" Value="True">
                    <Setter TargetName="bd" Property="Background" Value="#7092BE"/>
                    <Setter TargetName="text" Property="Foreground" Value="White"/>
                    <Setter TargetName="tags" Property="Foreground" Value="White"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Tags}" Value="">
                    <Setter TargetName="tags" Property="Visibility" Value="Collapsed"/>
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </TreeView.Resources>
</TreeView>