javax.faces.el.ReferenceSyntaxException: Functions not suppo

[andrew.rw.robinson]

When I use #{s:hasRole('test')} in a facelet view it works. However, when I try to use facesContext.getApplication().createValueBinding("#{s:hasRole('test')}"); I get the following error:

...
Caused by: javax.faces.el.ReferenceSyntaxException: Functions not supported in expressions. Function: s:hasRole
 at org.apache.myfaces.el.ValueBindingImpl$1.resolveFunction(ValueBindingImpl.java:74)
 at org.apache.commons.el.FunctionInvocation.evaluate(FunctionInvocation.java:148)
 at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:386)
 ... 62 more

How can I get the support of functions from the createValueBinding(String) method?

Environment:
MyFaces 1.1.5
MyFaces Tomahawk 1.1.6
JBoss Seam 1.2.1
Facelets 1.1.11
Ajax4Jsf 1.1.1
RichFaces 3.0.1

Thanks,
Andrew