Parent Action and refresh components

Sometimes we need refresh or access components from region but the problem is that, these components are binding in a bean of master page.

Typical example is when you have a paneltab where each tab is a region  and you need access acomponent for master page.

In this case you can make use of Parent Action, for invoke a parent action activity.

The schema is showed in next diagram:


Another way is get a instance of master bean from region bean.

ExternalContext exctxt = FacesContext.getCurrentInstance().getExternalContext();

MasterBean mBean = (MasterBean) exctxt.getRequestMap().get("MasterBean");

Oficial Doc: Using Parent Action Activities