title: How to capture PropertyChanged event from ViewModel?
body: <p>I created two viewmodel, MyViewModel, MyViewModel2. MyViewModel2 include MyViewModel as property. MyViewModel include one entity MyEntity from EF/WCF Ria Service.</p>
  
  <p>In MyViewModel2, I want to capture any item changes in MyEntity for databinding. My code like below:</p>
  
  <pre><code>public class MyViewModel : ViewModelBase
  {
          //....
          public MyViewModel(myEntity myEntity)
              : this()
          {
              //....
              this._myEntity = myEntity;
              this._myEntity.PropertyChanged += new PropertyChangedEventHandler(_myEntity_PropertyChanged);
              this.RaisePropertyChanged("MyEntity");
          }
  
          void _myEntity_PropertyChanged(object sender, PropertyChangedEventArgs e)
          {                
              this.RaisePropertyChanged("MyEntity");            
          }
  
    private MyEntity _myEntity;
          public MyEntity MyEntity
          {
              get { return this._myEntity; }
              set
              {
                  if (value != this._myEntity)
                  {
                      this._myEntity = value;
                      RaisePropertyChanged("MyEntity");
                  }
              }
          }
  }
  
  
  public class MyViewModel2 : ViewModelBase
  {    
        public MyViewModel2(){
          this._MyViewModel =  new MyViewModel();
          this._MyViewModel.PropertyChanged += new PropertyChangedEventHandler(_MyViewModel_PropertyChanged);  
        }
  
         void _MyViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
          {
             //do something here....
          }
  
  
          private MyViewModel _MyViewModel;
          public MyViewModel MyViewModel
          {
              get { return this._MyViewModel; }
              set
              {
                  if (value != this._MyViewModel)
                  {
                      this._MyViewModel = value;
                      RaisePropertyChanged("MyViewModel");
                  }
              }
          }
  }
  </code></pre>
  
  <p>then I run the app and change data in MyEntity, but I can't capture the changed event in MyViewModel2.</p>
  
  <p>How to resolve this problem?</p>