prs/prs.desktop/Panels/DataEntry/DataEntryReGroupWindow.xaml

<Window x:Name="Window"
        x:Class="PRSDesktop.DataEntryReGroupWindow"
        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:PRSDesktop"
        xmlns:dataentry="clr-namespace:PRSDesktop.Panels.DataEntry"
        mc:Ignorable="d"
        Title="Group Documents" Height="600" Width="1000">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <DockPanel Grid.Row="0" Grid.Column="0">
            <Label Content="Select Documents" FontWeight="Bold"/>
        </DockPanel>
        <DockPanel Grid.Row="0" Grid.Column="1">
            <Label Content="Groups" FontWeight="Bold"/>
        </DockPanel>
        <Border Grid.Row="1" Grid.Column="0"
                BorderBrush="Gray" BorderThickness="1"
                Margin="5">
            <ScrollViewer VerticalScrollBarVisibility="Auto">
                <WrapPanel Name="Documents"
                           Background="DimGray"
                           AllowDrop="True"
                           PreviewDragOver="Documents_DragOver"
                           Drop="Documents_Drop"/>
            </ScrollViewer>
        </Border>
        <ListBox x:Name="GroupList" ItemsSource="{Binding ElementName=Window,Path=Groups}"
                 Grid.Row="1" Grid.Column="1"
                 HorizontalContentAlignment="Stretch"
                 VerticalContentAlignment="Stretch">
            <ListBox.ItemTemplate>
                <DataTemplate DataType="{x:Type dataentry:DocumentGroup}">
                    <Label Content="{Binding FileName}">
                        <Label.ContextMenu>
                            <ContextMenu>
                                <MenuItem Header="Un-group Pages" Tag="{Binding}" Click="Ungroup_Click"/>
                            </ContextMenu>
                        </Label.ContextMenu>
                    </Label>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <DockPanel Grid.Row="2" Grid.Column="0">
            <Label Content="Document Name"
                   DockPanel.Dock="Left"
                   Margin="5"
                   VerticalContentAlignment="Center"/>
            <Button x:Name="Group" Content="Group" 
                    DockPanel.Dock="Right"
                    Margin="0,5,5,5"
                    Padding="5"
                    Width="70"
                    IsEnabled="False"
                    Click="Group_Click"/>
            <ComboBox Name="TagBox"
                      DockPanel.Dock="Right"
                      Margin="0,5,5,5"
                      VerticalContentAlignment="Center"
                      Width="150"/>
            <Label Content="Tag"
                   DockPanel.Dock="Right"
                   Margin="0,5,5,5"
                   VerticalContentAlignment="Center"/>
            <TextBox x:Name="GroupName" Background="LightYellow"
                     DockPanel.Dock="Left"
                     VerticalContentAlignment="Center"
                     Margin="0,5,5,5"/>
        </DockPanel>
        <DockPanel Grid.Row="2" Grid.Column="1"
                   LastChildFill="False">
            <Button Content="Cancel" 
                    DockPanel.Dock="Right"
                    Margin="5"
                    Padding="5"
                    Width="70"
                    Click="Cancel_Click"/>
            <Button Content="OK" 
                    DockPanel.Dock="Right"
                    Margin="5,5,0,5"
                    Padding="5"
                    Width="70"
                    Click="OK_Click"/>
        </DockPanel>
    </Grid>
</Window>