Problem with fragmenting org.adempiere.ui.zk web-based bundle

[Mr.Green]

Hi community! 

I'm currently facing a problem of fragmenting one of iDempiere OSGi bundles. Everything is ok, I successfully created fragments for some bundles like org.adempiere.base, but when I create a new fragment of bundle org.adempiere.ui.zk, it doesn't work. The new classes in fragment simply aren't pushed into host bundle, so class overriding doesn't work. 

I think it's because org.adempiere.ui.zk bundle is a web-application bundle, but I don't know how to properly do it --> because for every other bundle it works like a charm. 

Does somebody have experiences in this domain and could help me? 

Thanks.

Pavol