title: How to set propertygrid griditem tag
body: <p>I've got a PropertyGrid that reflects properties of my class.</p>
  
  <p>I am watching the PropertyValueChanged event and notice that PropertyValueChangedEventArgs provides the GridItem that was changed.</p>
  
  <p>That GridItem has a Tag property that I can get. I don't see how to set the Tag property of a GridItem to a value.</p>
  
  <p>How can I set the Tag property of a GridItem?</p>