     sprint("insertNewLine")
     disableTextField()
     concept.editing = false
-    needsDisplay = true
   }
   
   override func cancelOperation(sender: AnyObject?) {

import Cocoa

class ConceptView: NSView, NSTextFieldDelegate {
  let concept: Concept
  var added = false
  let textField: NSTextField
  

    if canvas?.mode == .Concepts {
      if let concept = concept {
        concept.editing = true
      }
    }
    sprint("conceptView: mouse down \(concept?.identifier)")
