[TYPO3] using added tt_news fields with news_feedit

[Stefan Kaufmann]

Hi everyone,
I added some text-fields to tt_news and they do appear in BE and FE. I 
installed news_feedit to edit my news records and the extension works 
fine. The added fields (used extension kickstarter) however won't show 
up when trying to edit or create new news records with news_feedit. Only 
  the standard tt_news fields show. I also added this to my TS-setup:

plugin.tx_newsfeedit_pi1.mthfeedit {
// Creating
create.fields = 
title,datetime,image,imagecaption,imagealttext,imagetitletext,related,short,bodytext,author,author_email,category,news_files,links,type,keywords,archivedate,ext_url,hidden
create.show_fields = 
title,bodytext,tx_ttnewsaddfields_field_1,short,datetime,author,author_email,image,category
create.overrideValues {
hidden = 1
}
}

...but no success. The field 'tx_ttnewsaddfields_field_1' is the one I 
wish to add...
Does anyone have a tip on how to solve this?
Many thanks
Stefan