title: django ajax select add button
body: <p>i installed django-ajax-select app,
  its a wonderful app to have auto-complete option,
  but after adding the form in admin.py 
  the (+) button which is i can add new object  i attached a snapshot of an example,</p>
  
  <p>i found a code which is splitting the value what are written by hooking clean method to override,
  but in my case i just want the add button</p>
  
  <pre><code>def clean(self, value):
  if value:
      lookup = get_lookup(self.channel)
      objs = lookup.get_objects( [value] )
      if objs:
          return objs[0]
      else:
          firstname, surname = value.split(" ")
          gender = self.channel.split("_")[0]
          new_skater = Skater(name=firstname, surname=surname, gender=gender)
          return new_skater
  else:
      if self.required:
          raise forms.ValidationError(self.error_messages['required'])
      return None
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/JGSdj.png" alt="enter image description here"></p>