title: silverlight - communicate between 2 view models in MVVM using commands
body: <p>i am working on MVVM and using commanding in silverlight(DelegateEvent and ICommand)</p>
  
  <p>I want something like this ,(say) i have 2 usercontrols , parent and child .</p>
  
  <p>Parent is hosting the child , both have thier own viewmodels .</p>
  
  <p>On parent i have a button and it executes a simple command , on execute of that command i want to update text in the child control's textbox . also we should be able to change something in child which can propagate to the parent .</p>
  
  <p>Is events the best answer for this or i can have commands to update child/notify parent in some way. </p>