Domino Designer / : Option to display field names in a document

Did you ever open a document and wonder where a specific field is used? Of course, you can open a form in Designer, but then you don't see the value.  So you'll have to go back to the client, look at that spot where you find your field and see what value is there, or check it in the document properties.

It would be a lot easier when you could just click a button that displays the fieldnames with a little tag above the field values when you're in a document.  Some extra option you have as a designer.