Composite vs. Bean CDI - How to access bean methods

I'm trying to create a component to receive the photo from the user's profile. But for this I need to make the access component the methods within the CDI Bean of the page in question. I'm doing something like this:

Creating the component:

<composite:interface displayName="profilePhoto">
<composite:attribute name="mBean" type="br.com.fm.modelo.abstracts.ProfilePhoto" required="true"
shortDescription="Bean que gerencia esta página." />
</composite:interface>

<composite:implementation>
[...cut...]
<p:commandButton action="#{cc.attrs.mBean[fecharFotoDialog]}"/>
[...cut...]
</composite:implementation>

Creating the Bean:

@Named
@ViewScoped
public class CadastroUsuario extends ProfilePhoto implements Serializable {
public void fecharFotoDialog() {
System.out.println("Entrei nesse treco aqui...");
}
}

Calling the component in the firstfaces:

<t:profilePhoto mBean="#{cadastroUsuario}"/>

What do I expect to happen? That by clicking on the button that is in the component the fecharFotoDialog() method is called.

Some direction on where I'm going wrong?

Thank you,