Activate window, close window, bring window to front

   
  

<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:system="clr-namespace:System.Windows;assembly=PresentationFramework"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Main Window" Height="310" Width="280" Loaded="Window1_Loaded">
  <Window.Resources>
    <DataTemplate DataType="{x:Type Window}" x:Key="WindowTemplate">
      <StackPanel>
        <Rectangle Height="50" Width="50">
          <Rectangle.Fill>
            <VisualBrush Visual="{Binding}" />
          </Rectangle.Fill>
        </Rectangle>
        <TextBlock Text="{Binding Path=Title}" />
      </StackPanel>
    </DataTemplate>
  </Window.Resources>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="100" />
      <RowDefinition Height="*" />
    </Grid.RowDefinitions>

    <ListBox x:Name="lbxWindows" ItemTemplate="{StaticResource WindowTemplate}">
      <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
          <WrapPanel />
        </ItemsPanelTemplate>
      </ListBox.ItemsPanel>
    </ListBox>

    <StackPanel Grid.Row="1">
      <CheckBox x:Name="cbxIsVisibleInTaskBar" Content="IsVisibleInTaskbar" IsChecked="{Binding ElementName=lbxWindows, Path=SelectedItem.ShowInTaskbar}"/>
      <CheckBox x:Name="cbxIsVisible" Content="IsVisible" 
      IsChecked="{Binding ElementName=lbxWindows, Path=SelectedItem.IsVisible, Mode=OneWay}" 
      Checked="CheckBox_Checked_Changed" 
        Unchecked="CheckBox_Checked_Changed"/>
      <CheckBox x:Name="cbxCanClose" Content="CanClose" IsChecked="True"/>
      <Button Content="Bring To Front" Click="btnBringToFront_Click" />
      <Button Content="Close" Click="btnClose_Click"/>
    </StackPanel>
  </Grid>
</Window>
//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            for (int i = 1; i <= 5; i++)
            {
                Window window = new Window();

                SetupWindow(window, "Window " + i);

                window.Show();
            }
            
            RebuildWindowList();
        }
        private void SetupWindow(Window window, string title)
        {
            window.Closing += new CancelEventHandler(Window_Closing);
            window.Closed += new EventHandler(Window_Closed);
            window.Title = title;
            window.Width = 100d;
            window.Height = 100d;
            window.Content = title;
        }
        private void RebuildWindowList()
        {
            List<Window> windows = new List<Window>();

            foreach (Window window in Application.Current.Windows)
            {
                if (window == this)
                    continue;

                windows.Add(window);
            }

            lbxWindows.ItemsSource = windows;
        }

        private void Window_Closed(object sender, EventArgs e)
        {
            RebuildWindowList();
        }

        private void Window_Closing(object sender, CancelEventArgs e)
        {
            Window w = sender as Window;

            if (w == null)
                return;

            e.Cancel = !cbxCanClose.IsChecked == true;
        }

        private void CheckBox_Checked_Changed(object sender, RoutedEventArgs e)
        {
            Window window = lbxWindows.SelectedItem as Window;

            if (window == null) 
                return;

            if (cbxIsVisible.IsChecked == true)
                window.Show();
            else
                window.Hide();
        }

        private void btnBringToFront_Click(object sender, RoutedEventArgs e)
        {
            Window window = lbxWindows.SelectedItem as Window;

            if (window != null)
                window.Activate();
        }

        private void btnClose_Click(object sender, RoutedEventArgs e)
        {
            Window window = lbxWindows.SelectedItem as Window;

            if (window != null)
                window.Close();
        }
    }
}