title: WPF CommandParameter in Textbox
body: <p>I am using MVVM pattern and i have a textbox in parent window and want to send some text to the popup window which will appear on Textchanged.</p>
  
  <p>I tried using commandparameter but it is not working for me.</p>
  
  <p>Please help..</p>
  
  <p>Thanks
  Sharath                      </p>