Make attributes of Composite Component from JAR available in autocomplete

Question

I've made a Composite Component and archived it in a *.jar file. My solution is based on this tutorial : How to package JSF2 composite component as distributable JAR and this question: Java EE6> Packaging JSF facelets (xhtml) and ManagedBeans as JAR. Everything works fine but I can't used autocomplete in Eclipse to add attributes of Composite Component when I add it through *.jar file. When I add it manually, i.e. place code in resources/composite_components everything works fine. I'm using RAD 8.5.5 Thank you in advance.