Create multi part 3d mesh for cocos2d-x

hi .
i create a mesh in blender that have 3 part.
when i load it to cocos2d-x its showing truely but getmeshcount() return 0(zero).
in blender scene :

when make one of them parent of other then getmeshcount() return 1(one).

what can i do to access to child part ?
how i can access to other part when they havent parent ?

thanks.

Get children… you will have those other meshes as sprite3D instances