MethodBinding which generates a list of suggested input values based on
the currently entered text, which could be retrieved via getSubmittedValue() on the UIIn.
The expression has to evaluate to a public method which has a javax.faces.component.UIInput parameter
and returns a List<String>(deprecated), a List<org.apache.myfaces.tobago.model.AutoSuggestItem>
or a org.apache.myfaces.tobago.model.AutoSuggestItems.