Need help with rendering teaser for new item type template - ZOO 2.х

/media/zoo/applications/movie/templates/default/renderer/item

Think if i created new item type example (demo_type) with seperate template. (media\zoo\applications\movie\templates\default\renderer\item\demo_type)
added files which it needed positions.xml , metadata.xml  full.php, teaser.php
added positions in positons.xml file..

full.php works fine with all item type along with there own templates... but teaser.php get only get default template from (media\zoo\applications\movie\templates\default\renderer\item\teaser.php)

In this path(media\zoo\applications\movie\templates\default)
i checked item.php(full.php trigger) code its crazy i tried same code adding in _item.php(teaser.php trigger) and i changed "full" to "teaser" but its not working...

I hope you understood well and sorry if u think its bad english