CCNode Auto Animation built in CocosBuilder

i have some problems in loading ccnode class that is made by cocosbuilder.

  1. create a ccb file, extend CCNode.
  2. add sprite and its animation.
    if i load ccbi file as CCLayer subclass in xcode, its animation run correctly.
    but if i load it as CCNode subclass, then its animation doesn’t run.
    i have already analysis cocos2d-x source code. but i can’t fix my errors.
    please help me!
    thanks.