title: Django Grappelli_Nested Inlines cannot create new nested lines after initial load
body: <p>I am looking for a way to create a new nested row, before saving the "owner"-row.
  By way of django ticket 9025 I found <a href="https://github.com/datahub/grappelli-nested-inlines" rel="nofollow">Grappelli-Nested-Inlines</a> which I have been using. </p>
  
  <p>I have a test project set up based on the instructions found at that link:</p>
  
  <pre><code>from django.contrib import admin
  from grappelli_nested.admin import NestedModelAdmin, NestedStackedInline, NestedTabularInline
  from .models import *
  
  class MyNestedInline(NestedTabularInline):
  model = C
  extra = 0
  
  class MyInline(NestedStackedInline):
  model = B
  extra = 0
  inlines = [MyNestedInline,]
  
  class MyAdmin(NestedModelAdmin):
  inlines = [MyInline,]
  
  admin.site.register(A, MyAdmin)
  </code></pre>
  
  <p>My issue is based in the fact that I cannot create a child object before saving the parent. That is to say, the "add another c"-button has no functionality before saving B </p>
  
  <p>Is there a way to achieve this?</p>
  
  <p>I have read through all the posts regarding this that I could find, but I have to say that if the answer is included anywhere, then I didn´t understand it, so please be patient with me.</p>
  
  <p>I should also note, that because of the production code, grappelli is a requirement, so anything that clashes with that will not work.</p>