MainWindow.xaml

<Window x:Class="WpfTreeView.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfTreeView"
        Loaded="Window_Loaded"
        mc:Ignorable="d"
        Name="This"
        Title="MainWindow" Height="450" Width="800">

    <Window.InputBindings>
        <KeyBinding Key="C" Modifiers="Ctrl" Command="{Binding ElementName=This, Path=CopyCommand}"/>
        <KeyBinding Key="V" Modifiers="Ctrl" Command="{Binding ElementName=This, Path=PasteCommand}"/>
        <KeyBinding Key="X" Modifiers="Ctrl" Command="{Binding ElementName=This, Path=CutCommand}"/>
    </Window.InputBindings>
    <Window.Resources>
        <BitmapImage x:Key="PythonIcon" UriSource="Images/python.png"/>
        <BitmapImage x:Key="CSharpIcon" UriSource="Images/csharp.png"/>
        <BitmapImage x:Key="CIcon" UriSource="Images/c.png"/>
        <BitmapImage x:Key="CppIcon" UriSource="Images/cpp.png"/>
        <BitmapImage x:Key="JavaIcon" UriSource="Images/java.png"/>
        <BitmapImage x:Key="JavascriptIcon" UriSource="Images/javascript.png"/>
        <BitmapImage x:Key="TextIcon" UriSource="Images/txt.png"/>
        <BitmapImage x:Key="JsonIcon" UriSource="Images/json.png"/>
        <BitmapImage x:Key="XslxIcon" UriSource="Images/xlsx.png"/>
        <BitmapImage x:Key="PdfIcon" UriSource="Images/pdf.png"/>
        <local:HeaderToImageConverter x:Key="ImageConverter"/>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>

        <StackPanel Orientation="Horizontal" Grid.Row="0">
            <Button Content="Copy" Command="{Binding ElementName=This, Path=CopyCommand}"/>
            <Button Content="Paste" Command="{Binding ElementName=This, Path=PasteCommand}"/>
            <Button Content="Cut" Command="{Binding ElementName=This, Path=CutCommand}"/>
        </StackPanel>
        <TreeView x:Name="FolderView"
                  Grid.Row="1"
                  SelectedItemChanged="FolderView_SelectedItemChanged"
                  Focusable="True"
                  AllowDrop="True">
            <TreeView.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Refresh" Command="{Binding RefreshCommand}"/>
                    <MenuItem Header="Copy" Command="{Binding CopyCommand}"/>
                    <MenuItem Header="Paste" Command="{Binding PasteCommand}"/>
                    <MenuItem Header="Cut" Command="{Binding CutCommand}"/>
                    <MenuItem Header="Open in Explorer" Command="{Binding OpenExplorerCommand}"/>
                </ContextMenu>
            </TreeView.ContextMenu>

            <TreeView.Resources>
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="KeyboardNavigation.TabNavigation" Value="Continue"/>
                    <Setter Property="HeaderTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <Image Width="20" Margin="3" 
                                           Source="{Binding 
                                                    RelativeSource={RelativeSource 
                                                    Mode=FindAncestor, 
                                                    AncestorType={x:Type TreeViewItem}},
                                                    Path=Tag,
                                                    Converter={StaticResource ImageConverter}
                                        }" />
                                    <TextBlock VerticalAlignment="Center" Text="{Binding}" />
                                </StackPanel>
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </TreeView.Resources>


            <TreeView.ItemContainerStyle>
                <Style TargetType ="{x:Type TreeViewItem}">
                    <!-- We have to select the item which is right-clicked on -->
                    <!--<EventSetter Event="TreeViewItem.DragOver" Handler="treeView_DragOver" />-->
                    <!--<EventSetter Event="TreeViewItem.Drop" Handler="treeView_Drop" />-->
                    <!--<EventSetter Event="TreeViewItem.MouseMove" Handler="treeView_MouseMove" />-->
                </Style>
            </TreeView.ItemContainerStyle>
        </TreeView>
    </Grid>
</Window>