BindingParam not work with @Init

Is there an example of @BindingParam in @Init anywhere? When I try

<vlayout apply="org.zkoss.bind.BindComposer"
viewModel="@id('vm') @init('some.ViewModel', foo='some string')">

with

@Init
public void initialize(@BindingParam("foo") String foo) {

foo is null instead of "some string"