Composite Application Reloaded

<UserControl 
  x:Class="DemoApp.View.AllCustomersView"
	x:Name="root"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
  >
  <UserControl.Resources>
	<CollectionViewSource
	  x:Key="CustomerGroups" 
	  Source="{Binding Path=AllCustomers}"
	  >
	  <CollectionViewSource.GroupDescriptions>
		<PropertyGroupDescription PropertyName="Customer.IsCompany" />
	  </CollectionViewSource.GroupDescriptions>
	  <CollectionViewSource.SortDescriptions>
		<!-- 
		Sort descending by IsCompany so that the 'True' values appear first,
		which means that companies will always be listed before people.
		-->
		<scm:SortDescription PropertyName="Customer.IsCompany" Direction="Descending" />
		<scm:SortDescription PropertyName="DisplayName" Direction="Ascending" />
	  </CollectionViewSource.SortDescriptions>
	</CollectionViewSource>

	<GroupStyle x:Key="CustomerGroupStyle">
	  <GroupStyle.HeaderTemplate>
		<DataTemplate>
		  <TextBlock 
			x:Name="txt" 
			Background="{StaticResource Brush_HeaderBackground}"
			FontWeight="Bold"
			Foreground="White"
			Margin="1"
			Padding="4,2,0,2"
			Text="People" 
			/>
		  <DataTemplate.Triggers>
			<DataTrigger Binding="{Binding Path=Name}" Value="True">
			  <Setter TargetName="txt" Property="Text" Value="Companies" />
			</DataTrigger>
		  </DataTemplate.Triggers>
		</DataTemplate>
	  </GroupStyle.HeaderTemplate>
	</GroupStyle>

	<Style x:Key="CustomerItemStyle" TargetType="{x:Type ListViewItem}">
	  <!-- 
	  Stretch the content of each cell so that we can 
	  right-align text in the Total Sales column. 
	  -->
	  <Setter Property="HorizontalContentAlignment" Value="Stretch" />
	  <!-- 
	  Bind the IsSelected property of a ListViewItem to the 
	  IsSelected property of a CustomerViewModel object.
	  -->
	  <Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}" />
	  <Style.Triggers>
		<MultiTrigger>
		  <MultiTrigger.Conditions>
			<Condition Property="ItemsControl.AlternationIndex" Value="1" />
			<Condition Property="IsSelected" Value="False" />
			<Condition Property="IsMouseOver" Value="False" />
		  </MultiTrigger.Conditions>
		  <Setter Property="Background" Value="#EEEEEEEE" />
		</MultiTrigger>
	  </Style.Triggers>
	</Style>
  </UserControl.Resources>

  <DockPanel>
	<Grid DockPanel.Dock="Bottom" Margin="0,2,4,2">
	  <StackPanel HorizontalAlignment="Right" Orientation="Horizontal" VerticalAlignment="Center">
		<TextBlock Text="Total selected sales: " />
		<ContentPresenter
		  Content="{Binding Path=TotalSelectedSales}"
		  ContentStringFormat="c"
		  />
	  </StackPanel>
	</Grid>

	<ListView 
	  AlternationCount="2" 
	  DataContext="{StaticResource CustomerGroups}" 
	  ItemContainerStyle="{StaticResource CustomerItemStyle}"
	  ItemsSource="{Binding}"
	  >
	  <ListView.GroupStyle>
		<StaticResourceExtension 
		  ResourceKey="CustomerGroupStyle" 
		  />
	  </ListView.GroupStyle>

	  <ListView.View>
		<GridView>
			
		  <GridViewColumn 
			Header="Name" 
			DisplayMemberBinding="{Binding Path=DisplayName}" 
			/>
			
		  <GridViewColumn 
			Header="E-mail" 
			DisplayMemberBinding="{Binding Path=Customer.Email}" 
			/>
			
		  <GridViewColumn Header="Total Sales">
			<GridViewColumn.CellTemplate>
			  <DataTemplate>
				<ContentPresenter 
				  Content="{Binding Path=Customer.TotalSales}" 
				  ContentStringFormat="c"
				  HorizontalAlignment="Right"
				  />
			  </DataTemplate>
			</GridViewColumn.CellTemplate>
		  </GridViewColumn>

		<GridViewColumn Header="Edit">
			<GridViewColumn.CellTemplate>
				<DataTemplate>
					<Button
						Content="Edit"
						Command="{Binding DataContext.EditCommand, ElementName=root}"
						CommandParameter="{Binding}"
						/>
				</DataTemplate>
			</GridViewColumn.CellTemplate>
		</GridViewColumn>

				</GridView>
	  </ListView.View>
	</ListView>
  </DockPanel>
</UserControl>