I use the <h:commandLink> - Tag inside my modalPanel, and it works.
Do you have a form inside the modalPanel and what Web-Browser are you using? Because in the developer-guide is written, that commandButton or commandLink are not working in IE, when you do not have a form inside the modalPanel.
I use IE, Mozilla and Opera.
Everything works good witn RichFaces 3.0.0. Probrem with h:commandButton. It seems, h:commandLink works.
Snapshot doesn't work.
Do you have a h:form inside the panel also? It is very important because modal panel in moved on the top of the browser DOM in 3.0.1