MapViewer hosted in a WPF
MapWindow.xaml.cs
// Copyright 2010 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 

using System;
using System.Windows;
using System.Windows.Forms;
using System.Drawing;

using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Controls;

namespace WPFMapViewer
{
  /// <summary>
  /// Interaction logic for Window1.xaml
  /// </summary>
  public partial class MapWindow: Window
  {
    AxMapControl mapControl;
    AxToolbarControl toolbarControl;
    AxTOCControl tocControl;

    public MapWindow ()
    {
      InitializeComponent ();
      CreateEngineControls ();
    }

    // Create ArcGIS Engine Controls and set them to be child of each WindowsFormsHost elements
    void CreateEngineControls ()
    {
      //set Engine controls to the child of each hosts 
      mapControl = new AxMapControl ();
      mapHost.Child = mapControl;

      toolbarControl = new AxToolbarControl ();
      toolbarHost.Child = toolbarControl;

      tocControl = new AxTOCControl ();
      tocHost.Child = tocControl;
    }

    private void LoadMap ()
    {
      //Buddy up controls
      tocControl.SetBuddyControl (mapControl);
      toolbarControl.SetBuddyControl (mapControl);

      //add command and tools to the toolbar
      toolbarControl.AddItem ("esriControls.ControlsOpenDocCommand");
      toolbarControl.AddItem ("esriControls.ControlsAddDataCommand");
      toolbarControl.AddItem ("esriControls.ControlsSaveAsDocCommand");
      toolbarControl.AddItem ("esriControls.ControlsMapNavigationToolbar");
      toolbarControl.AddItem ("esriControls.ControlsMapIdentifyTool");
      
      //set controls' properties
      toolbarControl.BackColor =Color.FromArgb (245, 245, 220);

      //wire up events
      mapControl.OnMouseMove +=new IMapControlEvents2_Ax_OnMouseMoveEventHandler(mapControl_OnMouseMove);
    }

    private void Window_Loaded (object sender, RoutedEventArgs e)
    {
      LoadMap ();
    }

    private void mapControl_OnMouseMove (object sender, IMapControlEvents2_OnMouseMoveEvent e)
    {
      textBlock1.Text = " X,Y Coordinates on Map: " + string.Format ("{0}, {1}  {2}", e.mapX.ToString ("#######.##"), e.mapY.ToString ("#######.##"), mapControl.MapUnits.ToString ().Substring (4));
    }

    private void Window_Closing (object sender, System.ComponentModel.CancelEventArgs e)
    {
      ESRI.ArcGIS.ADF.COMSupport.AOUninitialize.Shutdown ();
    }
  }
}