UINavigationController in a new IB window

[sefiroths]

i'm starting from a cocos2d project, then create window with IB and add them with:
Subv *a=[[Subv alloc] initWithNibFile:...]
[[CCDirector sharedDirector] openGLView] addSubView:a];

i'n mot able to make a new window NIB with NavigationController...
thanks