WPF

public partial class Directive : DependencyObject
    {
        public static readonly DependencyProperty DirectiveIDProperty = DependencyProperty.Register("DirectiveID", typeof(string),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty DirectiveNameProperty = DependencyProperty.Register("DirectiveName", typeof(string),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty DirectiveDescriptionProperty = DependencyProperty.Register("DirectiveDescription", typeof(string),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty PriorityProperty = DependencyProperty.Register("Priority", typeof(string),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty DefaultProperty = DependencyProperty.Register("Default", typeof(string),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty SetValueTypeProperty = DependencyProperty.Register("SetValueType", typeof(SetValueType),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty ConditionProperty = DependencyProperty.Register("Condition", typeof(Condition[]),
                                                                                               typeof(Directive));
        public static readonly DependencyProperty GroupProperty = DependencyProperty.Register("Group", typeof(Group[]),
                                                                                               typeof(Directive));
}

<Grid>
  <Grid.ColumnDefinitions>
    <ColumnDefinition Width="1*" />
    <ColumnDefinition Width="40" />
    <ColumnDefinition Width="1*" />
  </Grid.ColumnDefinitions>
  <ListBox Grid.Column="0" Name="supply" HorizontalAlignment="Stretch" />
  <!-- buttons -->
  <ListBox Grid.Column="2" Name="select" HorizontalAlignment="Stretch" />
</Grid>

public void LoadDirective()
        {
            //DerivedAttributeEntity oDAEEntity;
            listdata = new ObservableCollection<DADirective>();            
            SelectDirective = (DADirective)lbDirectiveList.SelectedItem;

            listdata.Add(new DADirective { DirectiveName = "Filter trading account", DirectiveDescription = "Rows will Trading account value to be filtered" });
            listdata.Add(new DADirective { DirectiveName = "Filter Counter party rows", DirectiveDescription = "Rows where counter party is null will be filtered" });
            listdata.Add(new DADirective { DirectiveName = "Filter USD currency records", DirectiveDescription = "Filter those rows where currency is USD" });

            lbDirectiveList.ItemsSource = listdata;
        }

private void btnNewDirectiveClicked(object sender, RoutedEventArgs e)
        {
            gDirectiveDetails.IsEnabled = true;
            gDerivedCondition.IsEnabled = true;
            DADirective dirdata = new DADirective { };
            
                   if (!listdata.Contains(dirdata))
            {
                    if (listdata.Count >= 0)
                    {
                        listdata.Add(new DADirective { });
                        lbDirectiveList.SelectedIndex = listdata.Count - 1;
                        txtDirectiveName.Focus();
                    }
                }
            
        }

<ListBox Grid.Row="1" Grid.Column="2" x:Name="lbDirectiveList" ItemsSource="{Binding}" SelectionChanged="lbDirectiveList_SelectionChanged" MaxHeight="200" SelectionMode="Single" ScrollViewer.VerticalScrollBarVisibility="Auto">
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Grid Margin="4">
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="Auto" />
                                            <ColumnDefinition Width="25" />
                                            <ColumnDefinition Width="*" />
                                        </Grid.ColumnDefinitions>

                                        <TextBlock Name="tbDirName" Text="{Binding Path=DirectiveName, Mode=TwoWay}" Grid.Column="0" FontWeight="Bold" MinWidth="200"/>
                                        <TextBlock Text=" - " Grid.Column="1"/>
                                        <TextBlock Grid.Column="2" Name="tbDirDesc" Text="{Binding Path=DirectiveDescription, Mode=TwoWay}" />
                                    </Grid>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>