MainWindow.xaml

<Window x:Class="DiskSnapshot.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:DiskSnapshot"
        Icon="App.ico" Title="DiskSnapshot" Height="500" Width="525" x:Name="Window">
  <Window.Resources>
    <ResourceDictionary>
      <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="TreeListView/themes/classic.xaml"/>
      </ResourceDictionary.MergedDictionaries>
      <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
      <local:BooleanToVisibilityNegatedConverter x:Key="BooleanToVisibilityNegatedConverter"/>
      <local:BooleanNotConverter x:Key="BooleanNotConverter"/>
      <DataTemplate x:Key="CellTemplate_Name">
        <Grid>
          <DockPanel LastChildFill="True">
            <Image x:Name="ImgNormal" DockPanel.Dock="Left" Source="Images/folder.png" Width="16" Height="16" Margin="0,0,4,0" VerticalAlignment="Center" Visibility="Visible" />
            <Image x:Name="ImgAdded" DockPanel.Dock="Left" Source="Images/folder_added.png" Width="16" Height="16" Margin="0,0,4,0" VerticalAlignment="Center" Visibility="Collapsed"/>
            <Image x:Name="ImgDeleted" DockPanel.Dock="Left" Source="Images/folder_deleted.png" Width="16" Height="16" Margin="0,0,4,0" VerticalAlignment="Center" Visibility="Collapsed"/>
            <Grid>
              <TextBlock x:Name="Txt" Text="{Binding Path=DirectoryName}"/>
            </Grid>
          </DockPanel>
        </Grid>
        <DataTemplate.Triggers>
          <DataTrigger Binding="{Binding Path=State}" Value="Added">
            <Setter TargetName="ImgNormal" Property="Visibility" Value="Collapsed"/>
            <Setter TargetName="ImgAdded" Property="Visibility" Value="Visible"/>
            <Setter TargetName="Txt" Property="Foreground" Value="DarkGreen"/>
          </DataTrigger>
          <DataTrigger Binding="{Binding Path=State}" Value="Deleted">
            <Setter TargetName="ImgNormal" Property="Visibility" Value="Collapsed"/>
            <Setter TargetName="ImgDeleted" Property="Visibility" Value="Visible"/>
            <Setter TargetName="Txt" Property="Foreground" Value="DarkRed"/>
          </DataTrigger>
        </DataTemplate.Triggers>
      </DataTemplate>
      <DataTemplate x:Key="CellTemplate_Size">
        <TextBlock Text="{Binding Path=CurrentSizeString}"/>
      </DataTemplate>
      <DataTemplate x:Key="CellTemplate_Delta">
        <TextBlock Text="{Binding Path=DeltaString}"/>
      </DataTemplate>
    </ResourceDictionary>
  </Window.Resources>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"/>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*"/>
      <ColumnDefinition Width="Auto"/>
    </Grid.ColumnDefinitions>
    <StackPanel Orientation="Horizontal" Margin="0,4" Grid.Row="0" Grid.Column="0">
      <TextBlock VerticalAlignment="Center" Margin="8,0" FontWeight="Bold" FontSize="16" Text="{Binding ElementName=Window, Path=DirectoryStructure.Root.DirectoryName}"/>
      <Button x:Name="BtnScan" Click="BtnScan_Click" MinWidth="80" Margin="3,0" IsEnabled="{Binding ElementName=Window, Path=Working, Converter={StaticResource BooleanNotConverter}}">Scan</Button>
      <TextBlock VerticalAlignment="Center" Margin="3,0" Visibility="{Binding ElementName=Window, Path=Working, Converter={StaticResource BooleanToVisibilityConverter}}">Working...</TextBlock>
      <Button x:Name="BtnSave" Click="BtnSave_Click" MinWidth="80" Margin="3,0"
              Visibility="{Binding ElementName=Window, Path=Working, Converter={StaticResource BooleanToVisibilityNegatedConverter}}">Save</Button>
      <Button x:Name="BtnSelectDrive" Click="BtnSelectDrive_Click" MinWidth="80" Margin="3,0"
              Visibility="{Binding ElementName=Window, Path=Working, Converter={StaticResource BooleanToVisibilityNegatedConverter}}">Select Drive</Button>
      <StackPanel Orientation="Horizontal" Visibility="{Binding ElementName=Window, Path=IsSelectingDrive, Converter={StaticResource BooleanToVisibilityConverter}}">
        <ComboBox x:Name="CbxDrives" ItemsSource="{Binding ElementName=Window, Path=AvailableDrives}" DisplayMemberPath="Name" Margin="3,0"/>
        <Button x:Name="BtnOKDrive" Click="BtnOKDrive_Click" Margin="3,0">Select</Button>
        <Button x:Name="BtnCancelDrive" Click="BtnCancelDrive_Click" Margin="3,0">Cancel</Button>
      </StackPanel>
      <TextBlock Text="{Binding ElementName=Window, Path=ProgressDirectory}" Margin="4,0" VerticalAlignment="Center"
                 Visibility="{Binding ElementName=Window, Path=Working, Converter={StaticResource BooleanToVisibilityConverter}}"/>
    </StackPanel>

    <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding ElementName=Window, Path=Progress}" Margin="4,0" VerticalAlignment="Center" HorizontalAlignment="Right"
               Visibility="{Binding ElementName=Window, Path=Working, Converter={StaticResource BooleanToVisibilityConverter}}"/>
    <local:TreeListView Grid.Row="1" Grid.ColumnSpan="2" ItemsSource="{Binding ElementName=Window, Path=DirectoryStructure.Root.Children}"
                        Style="{StaticResource TreeListViewStyle}">
      <local:TreeListView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Path=Children}">
          <TextBlock Text="{Binding Path=DirectoryName}"/>
        </HierarchicalDataTemplate>
      </local:TreeListView.ItemTemplate>
      <local:TreeListView.Columns>
        <GridViewColumn Header="Name" CellTemplate="{StaticResource CellTemplate_Name}" Width="200"/>
        <GridViewColumn Header="Size" CellTemplate="{StaticResource CellTemplate_Size}" Width="120"/>
        <GridViewColumn Header="Delta" CellTemplate="{StaticResource CellTemplate_Delta}" Width="120"/>
      </local:TreeListView.Columns>
      <local:TreeListView.ItemContainerStyle>
        <Style TargetType="{x:Type local:TreeListViewItem}" BasedOn="{StaticResource TreeListViewItemStyle}">
        </Style>
      </local:TreeListView.ItemContainerStyle>
    </local:TreeListView>
  </Grid>
</Window>