WPF

public partial class StationGroupControl : UserControl
    {
       
        public StationGroupControl()
        {

            try
            {

                if (ShowAggregates != true)
...

        public static DependencyProperty ShowAggregatesProperty =
            DependencyProperty.Register("ShowAggregates",
            typeof(Boolean),
            typeof(StationGroupControl),
            new FrameworkPropertyMetadata(false));

        public Boolean ShowAggregates
        {
            get
            {
                return (Boolean)GetValue(ShowAggregatesProperty);
            }
            set
            {
                SetValue(ShowAggregatesProperty, value);
            }
        }

<ResearchCtrl:StationGroupControl Name="MultStation" HorizontalAlignment="Left" Margin="-122,0,0,0" Validation.Error="Ctrl_Error" ShowAggregates="True"></ResearchCtrl:StationGroupControl>

<SolidColorBrush x:Key="BackgroundBrush" Color="Yellow"/>

Background="{TemplateBinding Background}"

Background="{DynamicResource BackgroundBrush}"

Background="{StaticResource BackgroundBrush}"

<Window x:Class="WpfApplication.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication"
    Title="MainWindow" Height="300" Width="300">
    <Window.Resources>
        <DataTemplate x:Key="RowTemplate"
                      DataType="{x:Type local:RowViewModel}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="Variable "/>
                    <TextBlock Text="{Binding Path=Slot}"/>
                </StackPanel>
                <ComboBox Grid.Column="1"
                          ItemsSource="{Binding Path=FirstList}"
                          SelectionChanged="Combo1SelectionChanged"/>
                <ComboBox Grid.Column="2"
                          ItemsSource="{Binding Path=SecondList}"
                          SelectionChanged="Combo2SelectionChanged"/>
            </Grid>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid x:Name="MainGrid">
        </Grid>
        <StackPanel Orientation="Horizontal"
                    HorizontalAlignment="Right">
            <Button Content="Ok"/>
            <Button Content="Cancel"/>
        </StackPanel>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace WpfApplication
{
    public class List1 : ObservableCollection<string>
    {
        public List1() : base()
        {
            Add("A");
            Add("B");
            Add("C");
        }
    }

    public class List2 : ObservableCollection<string>
    {
        public List2(string basedOn) : base()
        {
            Add(basedOn + "1");
            Add(basedOn + "2");
            Add(basedOn + "3");
        }
    }

    public class RowViewModel : INotifyPropertyChanged
    {
        private int m_slot = 0;
        private List1 m_firstList = null;
        private List2 m_secondList = null;

        public RowViewModel(int Slot)
        {
            this.Slot = Slot;
            this.FirstList = new List1();
            this.SecondList = new List2(Slot.ToString());
        }

        public int Slot
        {
            get
            {
                return m_slot;
            }
            set
            {
                if(value != m_slot)
                {
                    m_slot = value;
                    NotifyPropertyChanged("Slot");
                }
            }
        }

        public List1 FirstList
        {
            get
            {
                return m_firstList;
            }
            set
            {
                if (value != m_firstList)
                {
                    m_firstList = value;
                    NotifyPropertyChanged("FirstList");
                }
            }
        }

        public List2 SecondList
        {
            get
            {
                return m_secondList;
            }
            set
            {
                if (value != m_secondList)
                {
                    m_secondList = value;
                    NotifyPropertyChanged("SecondList");
                }
            }
        }

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }

        #endregion
    }

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            for(int i=0; i<10; i++)
            {
                RowDefinition rowDef = new RowDefinition();
                this.MainGrid.RowDefinitions.Add(rowDef);

                ItemsControl item = new ItemsControl();
//                item.ItemTemplate = this.RowTemplate;
                item.DataContext = new RowViewModel(i);
                item.SetValue(Grid.RowProperty, i);
                this.MainGrid.Children.Add(item);
            }
        }

        private void Combo1SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
        }

        private void Combo2SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
        }
    }
}