Vaadin Table with Checkboxes

myTable = new Table();
myTable.addContainerProperty("c1", Boolean.class, null);
myTable.setColumnCollapsed("c1", true);
myTable.addGeneratedColumn("chk1", new ColumnGenerator() {

    @Override
    public Object generateCell(Table source, final Object itemId, Object columnId) {
        Property prop = source.getItem(itemId).getItemProperty("c1");//columnId
        final CheckBox cb = new CheckBox(null, prop);
        cb.setImmediate(true);
        return cb;
    }
});
myTable.addContainerProperty("field", String.class, null);

// insert on table
myTable.addItem(new Object[] { rs.getBoolean("chk1"), rs.getString("field") }, null);