[Typo3] remove content with ext:template

[Thomas Axelsen]

New on list - so please be patient  :-)
Using templavoila and v3.8.0. I have a two-level menu on most of my 
pages in lib.mainMenu and lib.subMenu respectively, defined in main 
template. On one of my subpages I want to replace the submenu with a 
CATMENU. I've created an extension-template and added:

lib.subMenu >
lib.subMenu < plugin.tt_news
lib.subMenu {
  code >
  code = CATMENU
  pid_list >
  pid_list = 43 # the pids of the pages where your news are stored
  singlePid = 46
  backPid = 24
  displayCatMenu {
    # select root icon file
    catmenuRootIconFile = EXT:tt_news/res/tt_news_cat.gif
    # enable root icon
    catmenuNoRootIcon = 0
    # disable other icons
    catmenuIconMode = -1
  }
}

Problem is that the page still display the HMENU created in the 
main-template even though the Typoscript-object browser shows a tt_news 
content element on that particular page. What am I missing

Thanks
Thomas Axelsen