WPF

tbxItemUrl.SelectionStart = 0;
tbxItemUrl.SelectionLength = pageDetailItemSection.tbxItemUrl.Text.Length;
tbxItemUrl.SelectionBackground = new SolidColorBrush(Colors.Yellow);
tbxItemUrl.SelectionForeground= new SolidColorBrush(Colors.Black);

listbox     listbox     grid (editContainer)
Customers   Locations       3 comboboxes
                            2 textboxes
                            2 buttons

<navigation:Page 
           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"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"

           xmlns:dataInput="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input" 
           xmlns:DatabaseManager_Silverlight_MasterService="clr-namespace:DatabaseManager.Silverlight.MasterService" 
           xmlns:DatabaseManager_Silverlight="clr-namespace:DatabaseManager.Silverlight" 
           xmlns:mycompany_Silverlight_Controls="clr-namespace:mycompany.Silverlight.Controls;assembly=mycompany.Silverlight.Controls" 
           x:Class="DatabaseManager.Silverlight.Views.ManageCustomerLocations"
           d:DesignWidth="800" d:DesignHeight="600"
           Title="ManageCustomerLocations Page">
    <Grid x:Name="LayoutRoot" Background="#FFF8F8DE">
    	<Grid x:Name="editContainer" Margin="8,20,8,6">

    		<ListBox x:Name="customerList" HorizontalAlignment="Left" Margin="0,16,0,29" Width="183" SelectionChanged="CustomerSelectedEventHandler" DisplayMemberPath="CustomerName" />
    		<TextBox x:Name="message" Height="23" VerticalAlignment="Bottom" IsReadOnly="True" Text="{}{messages will appear here}" TextWrapping="Wrap"/>
    		<ListBox x:Name="customerLocations" HorizontalAlignment="Left" Margin="187,16,0,29" Width="100" SelectionChanged="CustomerLocationSelectedEventHandler" DisplayMemberPath="LocationID" />
    		<dataInput:Label HorizontalAlignment="Left" Margin="38,0,0,0" VerticalAlignment="Top" Width="72" Content="Customers" FontWeight="Bold" Foreground="#FF0D0D39" RenderTransformOrigin="1.153,0.562"/>
    		<dataInput:Label HorizontalAlignment="Left" Margin="204,0,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.567,1.562" Width="63" Content="Locations" FontWeight="Bold" Foreground="#FF0D0D39"/>
    		<Grid x:Name="locationContainer" Margin="291,16,0,29" IsHitTestVisible="False">
    			<Grid.DataContext>
    				<DatabaseManager_Silverlight_MasterService:CustomerLocation/>
    			</Grid.DataContext>
    			<Button x:Name="bmcKeyComputation" Margin="21,0,0,133" Content="Compute BMC Key" Click="ComputeBmcKeyEventHandler" Height="25" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="132"/>
    			<Button x:Name="submitChanges" Margin="21,0,31,65" VerticalAlignment="Bottom" Content="Create Location" Click="PostLocationEventHandler" ToolTipService.ToolTip="This button will create/update the location record."/>
    			<dataInput:Label HorizontalAlignment="Left" Margin="21,0,0,181" VerticalAlignment="Bottom" Content="Location Identity:" d:LayoutOverrides="HorizontalAlignment"/>
    			<TextBox x:Name="locationIdentity" HorizontalAlignment="Right" Margin="0,0,31,173" TextWrapping="Wrap" VerticalAlignment="Bottom" DataContext="{Binding LocationID, Mode=TwoWay, UpdateSourceTrigger=Explicit}" ToolTipService.ToolTip="This is the name for the location (office number, cage ID, etc)"/>
    			<TextBox x:Name="bmcKey" HorizontalAlignment="Right" Margin="0,0,31,134" TextWrapping="Wrap" VerticalAlignment="Bottom" DataContext="{Binding BmcLocKey, Mode=TwoWay, UpdateSourceTrigger=Explicit}" IsReadOnly="True" ToolTipService.ToolTip="The resulting BMC Key generated from the previous location data"/>
    			<dataInput:Label Height="20" VerticalAlignment="Top" Content="Building :" HorizontalAlignment="Left" Width="71" Margin="21,63,0,0"/>
    			<dataInput:Label Height="21" Margin="21,104,0,0" VerticalAlignment="Top" Content="Data Center :" HorizontalAlignment="Left" Width="80"/>
    			<dataInput:Label Height="19" Margin="21,146,0,0" VerticalAlignment="Top" Content="Location Type :" HorizontalAlignment="Left" Width="89"/>

    			<mycompany_Silverlight_Controls:ComboBoxClassic x:Name="buildingList" Margin="123,63,31,0" VerticalAlignment="Top" DisplayMemberPath="{Binding Building, Mode=TwoWay, UpdateSourceTrigger=Default}" ToolTipService.ToolTip="Identifies the starting point for this location"/>
    			<mycompany_Silverlight_Controls:ComboBoxClassic x:Name="dataCenterList" Margin="123,104,31,0" VerticalAlignment="Top" ToolTipService.ToolTip="Provides the secondary component of the location -- this changes based on 'building'" DataContext="{Binding DataCenter, Mode=TwoWay, UpdateSourceTrigger=Explicit}"/>
    			<mycompany_Silverlight_Controls:ComboBoxClassic x:Name="locationTypeList" Margin="123,146,31,0" VerticalAlignment="Top" ToolTipService.ToolTip="For true datacenter locations, this is the type of location the customer contracted" DataContext="{Binding LocationType, Mode=TwoWay, UpdateSourceTrigger=Explicit}"/>

    		</Grid>

    	</Grid>
    </Grid>
</navigation:Page>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Navigation;

using DatabaseManager.Silverlight.MasterService;

namespace DatabaseManager.Silverlight.Views
{
	public partial class ManageCustomerLocations : Page
	{

		#region Page initialization logic

		public ManageCustomerLocations( )
		{

			InitializeComponent( );
			buildingList.DisplayMemberPath = "BuildingName";
			buildingList.SelectedValuePath = "BuildingIdentity";
			buildingList.BindingValidationError+=new EventHandler<ValidationErrorEventArgs>(buildingList_BindingValidationError);

			dataCenterList.DisplayMemberPath = "DataCenterText";
			dataCenterList.SelectedValuePath = "DataCenterIdentity";
			dataCenterList.BindingValidationError+=new EventHandler<ValidationErrorEventArgs>(dataCenterList_BindingValidationError);

			locationTypeList.DisplayMemberPath = "LocationName";
			locationTypeList.SelectedValuePath = "LocationType";
			locationTypeList.BindingValidationError+=new EventHandler<ValidationErrorEventArgs>(locationTypeList_BindingValidationError);

			locationContainer.DataContext = new CustomerLocation( );
		}

		void locationTypeList_BindingValidationError( object sender, ValidationErrorEventArgs e )
		{
			MessageBox.Show( e.Error.Exception.Message );
		}

		void buildingList_BindingValidationError( object sender, ValidationErrorEventArgs e )
		{
			MessageBox.Show( e.Error.Exception.Message );
		}

		void dataCenterList_BindingValidationError( object sender, ValidationErrorEventArgs e )
		{
			MessageBox.Show( e.Error.Exception.Message );
		}
		bool InUpdateState = false;
		// Executes when the user navigates to this page.
		protected override void OnNavigatedTo( NavigationEventArgs e )
		{
			PopulateCustomerList( );
		}

		private void PopulateCustomerList( )
		{
			DataReflectorClient client = new DataReflectorClient( );
			client.OpenAsync( );
			client.GetActiveCustomersCompleted += new EventHandler<GetActiveCustomersCompletedEventArgs>( ActiveCustomersEventHandler );
			client.GetActiveCustomersAsync( );
			client.CloseAsync( );
			message.Text = "Loading active customers at this moment...please wait.";
		}

		#endregion

		#region Database Completion Event Handlers


		void GetCustomerLocationsCompletedEventHandler( object sender, GetCustomerLocationsCompletedEventArgs e )
		{
			customerLocations.ItemsSource = e.Result;
			if ( e.Error != null )
				SetWarningText( e.Error.Message );
			else
				SetEndingText( "Customer locations loaded successfully." );
			customerLocations.UpdateLayout( );
		}

		void ActiveCustomersEventHandler( object sender, GetActiveCustomersCompletedEventArgs e )
		{
			this.customerList.ItemsSource = e.Result;
			SetEndingText( "You may now choose the customer you want to work on." );
		}


		void GetLocationsCompleteEventHandler( object sender, GetLocationTypesCompletedEventArgs e )
		{
			locationTypeList.ItemsSource = e.Result;
			SetEndingText( "Dropdown boxes populated." );
			locationTypeList.UpdateLayout( );
		}

		void GetBuildingsCompleteEventHandler( object sender, GetBuildingEnumeratorsCompletedEventArgs e )
		{
			buildingList.ItemsSource = e.Result;
			SetEndingText( "Dropdown boxes populated." );
			buildingList.UpdateLayout( );
		}


		void LoadDataCenterEventHandler( object sender, GetDatacenterEnumeratorsCompletedEventArgs e )
		{
			dataCenterList.ItemsSource = e.Result;
			SetEndingText( "You may now select which datacenter the customer location is at." );
			dataCenterList.UpdateLayout( );
		}


		void HandleUpdateCompleteEventHandler( object sender, ManageCustomerLocationCompletedEventArgs e )
		{
			MessageResults results = e.Result as MessageResults;
			if ( results == null )
				SetWarningText( String.Format( "Unexpected result sent to completion event.  Type of result was : {0}", e.Result.GetType( ).ToString( ) ) );
			else if ( results.Status.Equals( 1 ) )
			{
				message.Text = String.Format( "Results:  {0}", results.Message );
			}
			else
				message.Text = String.Format( "Error: {0}  Reason : {1}.....ooops.", results.ErrorMessage, results.Reason );
			selectedLocation = null;
			//customerList.SelectedIndex = -1;
		}

		#endregion

		#region Selection Event Handler Implementations

		private void CustomerSelectedEventHandler( object sender, SelectionChangedEventArgs e )
		{
			customerLocations.ItemsSource = null;
			if ( customerList.SelectedIndex < 0 )
			{
				return;
			}

			CustomerMaster master = customerList.SelectedItem as CustomerMaster;
			if ( master == null )
			{
				SetWarningText( "There is a problem getting access to the selected customer." );
				return;
			}

			DataReflectorClient client = new DataReflectorClient( );
			client.OpenAsync( );

			client.GetCustomerLocationsCompleted += new EventHandler<GetCustomerLocationsCompletedEventArgs>( GetCustomerLocationsCompletedEventHandler );
			client.GetCustomerLocationsAsync( master.CustomerIdentity );
			InUpdateState = false;

			SetWarningText( "Populating dropdown boxes.  Please wait...." );



			client.GetBuildingEnumeratorsCompleted += new EventHandler<GetBuildingEnumeratorsCompletedEventArgs>( GetBuildingsCompleteEventHandler );
			client.GetBuildingEnumeratorsAsync( );
			client.GetLocationTypesCompleted += new EventHandler<GetLocationTypesCompletedEventArgs>( GetLocationsCompleteEventHandler );
			client.GetLocationTypesAsync( );

			client.CloseAsync( );

		}

		CustomerLocation selectedLocation = null;

		private void CustomerLocationSelectedEventHandler( object sender, System.Windows.Controls.SelectionChangedEventArgs e )
		{
			if ( customerLocations.SelectedIndex < 0 )
			{
				//buildingList.SelectedIndex = -1;
				//dataCenterList.SelectedIndex = -1;
				//locationTypeList.SelectedIndex = -1;
				//locationIdentity.Text = string.Empty;
				//bmcKey.Text = string.Empty;
			}
			else
			{
				InUpdateState = true;
				selectedLocation = customerLocations.SelectedItem as CustomerLocation;
				locationContainer.DataContext = selectedLocation;
				SetEndingText( String.Format( "Chosen location {0} is now loaded into the editor.", selectedLocation.LocationID) );
			}

		}


		private void BuildingSelectedEventHandler( object sender, SelectionChangedEventArgs e )
		{
			if ( buildingList.SelectedIndex < 0 ) return;

			SetWarningText( "Getting the datacenter locations for selected building location." );
			DataReflectorClient client = new DataReflectorClient( );
			client.OpenAsync( );
			client.GetDatacenterEnumeratorsCompleted += new EventHandler<GetDatacenterEnumeratorsCompletedEventArgs>( LoadDataCenterEventHandler );
			client.GetDatacenterEnumeratorsAsync( ( ( BuildingEnumerator )buildingList.SelectedItem ).BuildingIdentity );
			client.CloseAsync( );
		}

		private void DataCenterSelectedEventHandler( object sender, System.Windows.Controls.SelectionChangedEventArgs e )
		{
			if ( dataCenterList.SelectedIndex < 0 ) return;

			SetEndingText( "You may now select the location type if applicable to this location." );
		}

		private void locationTypeList_SelectionChanged( object sender, SelectionChangedEventArgs e )
		{
			// TODO: Add event handler implementation here.
		}

		#endregion

		#region Button Event handler implementations

		private void ComputeBmcKeyEventHandler(object sender, System.Windows.RoutedEventArgs e)
		{
			message.Text = string.Empty;
			BuildingEnumerator building = buildingList.SelectedItem as BuildingEnumerator;
			if ( building == null )
				message.Text = "You appear to have not selected a building yet.  You need a building location to compute a BMC Key.";
			else if ( locationIdentity.Text.Length.Equals( 0 ) )
				message.Text = "You appear to have not provided a location name.  Enter the location name before computing the BMC Key.";
			else
				bmcKey.Text = String.Concat( building.BuildingName.Substring( 0, 5 ), locationIdentity.Text );
		}

		private void PostLocationEventHandler(object sender, System.Windows.RoutedEventArgs e)
		{
			bool NoErrorsExist = true;
			BuildingEnumerator building=null;
			message.Text = string.Empty;

			if ( buildingList.SelectedItem == null )
			{
				message.Text += "No building selected.  ";
				NoErrorsExist = false;
			}
			else
				building = (BuildingEnumerator)buildingList.SelectedItem;
			if ( dataCenterList.SelectedItem == null )
			{
				message.Text += "No data center selected.  ";
				NoErrorsExist = false;
			}
			
			if ( locationTypeList.SelectedItem==null && building != null && building.BuildingName != "Exacent" && building.BuildingName!="Office" )
			{
				message.Text += "No location type selected.  ";
				NoErrorsExist = false;
			}
			if ( locationIdentity.Text.Length.Equals( 0 ) )
			{
				message.Text = "No location name given.  ";
				NoErrorsExist = false;
			}
			if ( bmcKey.Text.Length.Equals( 0 ) && building != null && building.BuildingName != "Exacent" && building.BuildingName != "Office" )
			{
				message.Text = "BMC Key has not been generated.  ";
				NoErrorsExist = false;
			}
			if ( NoErrorsExist )
			{
				DataReflectorClient client = new DataReflectorClient( );
				CustomerLocation newLocation = new CustomerLocation( );
				if ( customerLocations.SelectedIndex > 0 )
					newLocation = ( CustomerLocation )customerLocations.SelectedItem;

				client.OpenAsync( );

				if ( InUpdateState )
				{
					if ( newLocation.Building != ( ( BuildingEnumerator )buildingList.SelectedItem ).BuildingIdentity )
						newLocation.Building = ( ( BuildingEnumerator )buildingList.SelectedItem ).BuildingIdentity;
					if ( newLocation.DataCenter != ( ( DataCenterEnumerator )dataCenterList.SelectedItem ).DataCenterIdentity )
						newLocation.DataCenter = ( ( DataCenterEnumerator )dataCenterList.SelectedItem ).DataCenterIdentity;
					if ( newLocation.LocationType.HasValue && newLocation.LocationType.Value != ( ( LocationEnumerator )locationTypeList.SelectedItem ).LocationType )
						newLocation.LocationType = ( ( LocationEnumerator )locationTypeList.SelectedItem ).LocationType;
					if ( newLocation.LocationID != locationIdentity.Text )
						newLocation.LocationID = locationIdentity.Text;
					if ( newLocation.BmcLocKey != bmcKey.Text )
						newLocation.BmcLocKey = bmcKey.Text;
					
					client.ManageCustomerLocationCompleted += new EventHandler<ManageCustomerLocationCompletedEventArgs>( HandleUpdateCompleteEventHandler );
					client.ManageCustomerLocationAsync( newLocation, RequestType.Update );
					client.CloseAsync( );
				}
				else
				{
					CustomerLocation newlocation = new CustomerLocation();
					newlocation.LocationIdentity = Guid.NewGuid( );
					newlocation.CustomerIdentity = ( ( CustomerMaster )customerList.SelectedItem ).CustomerIdentity;
					newlocation.Building = ( ( BuildingEnumerator )buildingList.SelectedItem ).BuildingIdentity;
					newlocation.DataCenter = ( ( DataCenterEnumerator )dataCenterList.SelectedItem ).DataCenterIdentity;
					newlocation.LocationType = locationTypeList.SelectedIndex >= 0 ? ( ( LocationEnumerator )locationTypeList.SelectedItem ).LocationType : new Nullable<int>( );
					newlocation.LocationID = locationIdentity.Text;
					newlocation.BmcLocKey = bmcKey.Text;

					client.ManageCustomerLocationCompleted += new EventHandler<ManageCustomerLocationCompletedEventArgs>( HandleUpdateCompleteEventHandler );
					client.ManageCustomerLocationAsync( newlocation, RequestType.Create );
					client.CloseAsync( );
				}
			}
			else
			{
				message.Text += "Please correct errors.";
				return;
			}
		}

		#endregion

		void SetWarningText( string text )
		{
			SolidColorBrush brush = new SolidColorBrush( Colors.Red );
			message.Foreground = brush;
			message.Text = text;
		}
		void SetEndingText( string text )
		{
			SolidColorBrush brush = new SolidColorBrush( Colors.Black );
			message.Foreground = brush;
			message.Text = text;
		}


	}
}