Help ,how Can I Write A Contain Node ,thanks

[liuguanghui]

for the work ,that I want write a container node ,like the maya`s inside container node,can be collapes,can contain other nodes , if could be ,how many class will be used,I only know one MFnContainerNode,but ,it is only a MFn class ,is there any other MPxNode can do this?thanks every one!!!

[joojaa]

You can not

[liuguanghui]

then ,how can i do some thing to the container node ,like add attr to the container,and effect other attrs ,could I???thanks

[joojaa]

Nodes are all the same all the same rules apply.