Added support for letting a field over-riding the readonly status of a
entity member (e.g. set it to readony when the entity and/or property
allows edits.
Fixed an NPE when the advanced search button doesn't exist.
Added support for SingularAttribute.
Added support for an Combobox bound to a collection.
Added support for SingularAttribute.
Added support for setting column and label widths.
Added support for a Combobox based on a simple collection.
Improved error handling. We now check that visible columns are available
in the underlying PoJo. Also catch and logging illegal argument
exceptions when pulling values from the pojo.
This class is designed to get around a bug with the Vaadin access method
which doesn't seem to lock the session correctly causing the UI to
freeze if you attempt to updated it from a background thread.
upgraded to vaadin 7.1.4.