POCO Entities Through RIA Services

<UserControl 
  x:Class="BusinessApp.MainPage"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" 
  xmlns:uriMapper="clr-namespace:System.Windows.Navigation;assembly=System.Windows.Controls.Navigation"
  xmlns:dataControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.DataForm.Toolkit" 
  xmlns:login="clr-namespace:BusinessApp.LoginUI"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
  mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.DomainServices" xmlns:my="clr-namespace:EntRIAServices.Web;assembly=EntRIAServices" xmlns:my1="clr-namespace:Entities;assembly=EntRIAServices">

  <Grid x:Name="LayoutRoot" Style="{StaticResource LayoutRootGridStyle}">

    <Border x:Name="ContentBorder" Style="{StaticResource ContentBorderStyle}">
            <navigation:Frame x:Name="ContentFrame" Style="{StaticResource ContentFrameStyle}" 
                              Source="/Home" Navigated="ContentFrame_Navigated" NavigationFailed="ContentFrame_NavigationFailed">
                <navigation:Frame.UriMapper>
                  <uriMapper:UriMapper>
                    <uriMapper:UriMapping Uri="" MappedUri="/Views/Home.xaml"/>
                    <uriMapper:UriMapping Uri="/{pageName}" MappedUri="/Views/{pageName}.xaml"/>
                  </uriMapper:UriMapper>
                </navigation:Frame.UriMapper>
            </navigation:Frame>
    </Border>

    <Grid Style="{StaticResource NavigationOuterGridStyle}">
      <Grid x:Name="NavigationGrid" Style="{StaticResource NavigationGridStyle}">

        <Border x:Name="BrandingBorder" Style="{StaticResource BrandingBorderStyle}">
          <StackPanel x:Name="BrandingStackPanel" Style="{StaticResource BrandingStackPanelStyle}">

            <ContentControl Style="{StaticResource LogoIcon}"/>
            <TextBlock x:Name="ApplicationNameTextBlock" Style="{StaticResource ApplicationNameStyle}" 
                               Text="{Binding Strings.ApplicationName, Source={StaticResource ApplicationResources}}"/>

          </StackPanel>
        </Border>

        <Border x:Name="LinksBorder" Style="{StaticResource LinksBorderStyle}">
          <StackPanel x:Name="LinksStackPanel" Style="{StaticResource LinksStackPanelStyle}">

            <HyperlinkButton x:Name="Link1" Style="{StaticResource LinkStyle}" 
                                     NavigateUri="/Home" TargetName="ContentFrame" Content="{Binding Path=Strings.HomePageTitle, Source={StaticResource ApplicationResources}}"/>

            <Rectangle x:Name="Divider1" Style="{StaticResource DividerStyle}"/>

            <HyperlinkButton x:Name="Link2" Style="{StaticResource LinkStyle}" 
                                     NavigateUri="/About" TargetName="ContentFrame" Content="{Binding Path=Strings.AboutPageTitle, Source={StaticResource ApplicationResources}}"/>

          </StackPanel>
        </Border>

      </Grid>

      <Border Style="{StaticResource LoginContainerStyle}">
          <login:LoginStatus/>           
      </Border>
            <Grid DataContext="{Binding ElementName=zipDomainDataSource, Path=Data}" HorizontalAlignment="Left" Margin="319,0,0,311" Name="grid1" VerticalAlignment="Bottom">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition Width="Auto" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <sdk:Label Content="County:" Grid.Column="0" Grid.Row="0" HorizontalAlignment="Left" Margin="3" VerticalAlignment="Center" />
                <TextBox Grid.Column="1" Grid.Row="0" Height="23" HorizontalAlignment="Left" Margin="3" Name="countyTextBox" Text="{Binding Path=County, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true, TargetNullValue=''}" VerticalAlignment="Center" Width="120" />
            </Grid>
        </Grid>
        <riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance my1:Zip, CreateList=true}" Height="0" LoadedData="zipDomainDataSource_LoadedData" Name="zipDomainDataSource" QueryName="GetZipsQuery" Width="0">
            <riaControls:DomainDataSource.DomainContext>
                <my:EntityDomainContext />
            </riaControls:DomainDataSource.DomainContext>
        </riaControls:DomainDataSource>
    </Grid>

</UserControl>