I am looking for the right control to use for this situation, but I am having kind of a brain dead kind of day.

For a record (a person) there is a general notes field. Some people have notes and some people don't. I am creating a simple data entry/view form. I am looking for something like a dropdown textbox kind of thing, where the user can manually expand it if they need to view the text. They also need to be able edit the text.

Any ideas? I usually stick with with around 10 controls I am familiar with, but I am feeling a little saucy today.