diff --git a/src/pretix/control/forms/item.py b/src/pretix/control/forms/item.py
index 00b894395a..53ca965a17 100644
--- a/src/pretix/control/forms/item.py
+++ b/src/pretix/control/forms/item.py
@@ -1142,10 +1142,10 @@ class ItemAddOnForm(I18nModelForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.fields['addon_category'].queryset = self.event.categories.all()
-        self.fields['addon_category'].help_text = format_html('<a href="javascript:" data-django-dialog="{}?notify_parent=true">{}</a>', reverse('control:event.items.categories.add', kwargs={
+        self.fields['addon_category'].help_text = format_html('<a href="{}" data-iframe-dialog="true" data-iframe-dialog-target="<[name$=addon_category]" target="_blank">{}</a>', reverse('control:event.items.categories.add', kwargs={
                     'event': self.event.slug,
                     'organizer': self.event.organizer.slug,
-                }), _("Create new category"))
+                }), _("Create a new category"))
         self.fields['addon_category'].widget = Select2(
             attrs={
                 'data-model-select2': 'generic',
diff --git a/src/pretix/control/views/__init__.py b/src/pretix/control/views/__init__.py
index f6b4dcd201..430943e60e 100644
--- a/src/pretix/control/views/__init__.py
+++ b/src/pretix/control/views/__init__.py
@@ -52,7 +52,7 @@ class TellParentFormMixin:
             msgs = [{'level': msg.level_tag, 'message': msg.message} for msg in message_store]
             #message_store._queued_messages = []
             return render(self.request, 'pretixcontrol/notify_parent.html', {
-                'notify_info': {'object': self.object.pk, 'redirect_url': result.url, 'messages': msgs},
+                'notify_info': {'object': self.object.pk, 'object_str': str(self.object), 'redirect_url': result.url, 'messages': msgs},
             })
         else:
             return result