Vaadin Table with Checkboxes

myTable = new MyTable();
myTable.setContainerDataSource(Application.getInstance().getDbHelp().getMyContainer());
myTable.addGeneratedColumn("chk1", new ColumnGenerator() {

    @Override
    public Object generateCell(Table source, final Object itemId, Object columnId) {
        Property prop = source.getItem(itemId).getItemProperty(columnId);
        final CheckBox cb = new CheckBox(null, prop);
        cb.setImmediate(true);
        return cb;
    }
});
myTable.setVisibleColumns(new Object[] { "chk1", "field" });