title: UpdateSourceTrigger for multiple fields
body: <p>Based on:</p>
  
  <p><a href="https://stackoverflow.com/questions/4833100/updatesourcetrigger-propertychanged-equivalent-for-a-windows-phone-7-textbox">&quot;UpdateSourceTrigger=PropertyChanged&quot; equivalent for a Windows Phone 7 TextBox</a></p>
  
  <p>If my app have 100 textbox that needs to update their sources, Do I Have to use the code to update them all?</p>
  
  <pre><code>TextBlock1.GetBindingExpression(TexBlock.TextProperty).UpdateSource();
  TextBlock2.GetBindingExpression(TexBlock.TextProperty).UpdateSource();
  </code></pre>
  
  <p>...</p>
  
  <pre><code>TextBlock100.GetBindingExpression(TexBlock.TextProperty).UpdateSource();
  </code></pre>
  
  <p>I would like to do it <strong>without VisualTree</strong>. Something like to set the update to the parent object with a DataContext.</p>