title: How to capture a property changed even of one view model in another view model
body: <p>i have view model class A and it has the property "a".</p>
  
  <p>and i have class called B , and it ha sproperty "b" where i store list of all A[] as list.</p>
  
  <p>if any change in the property a , i would like to change the property in the parent class A.</p>
  
  <p>that is</p>
  
  <p>class B
  {</p>
  
  <p>property b1;</p>
  
  <p>List A[]</p>
  
  <p>}</p>
  
  <p>Class A
  {</p>
  
  <p>property a1;</p>
  
  <p>}</p>
  
  <p>I am using MVVM and notify property chnaged event is there in both the places. what i dont know how to wire up both . </p>