title: asp.net control to expand textbox?
body: <p>I'm not sure what this functionality is properly called.  But I have a single-line text box in an asp.net gridview.  When a user clicks on that textbox, I want a larger, multi-line textbox to pop-up, so they can see the entire contents and edit it.  This expanded view would go away once the focus moves to another control.  </p>
  
  <p>Is there a control out there that allows for this?  If not, how could I go about implementing one?</p>
  
  <p>EDIT:  I'm looking for similar function to how the TextBoxCalendar Extender works, but instead of a calendar, I'd like a multiline textbox to pop.</p>