Disable table write through when used as field in form

I would like to use a table as a field inside a form, but I would like to disable write through to the data source until commit is called on the form.

I am calling setWriteThrough(false) on both the table and form, but does not seem to work.

I am using 6.7.3

Here is an example of what I would like to do:

public class TabletestApplication extends Application {
	private Bean bean1;
	private Table table;

	@Override
	public void init() {
		Window mainWindow = new Window("Tabletest Application");
		setMainWindow(mainWindow);
		table = new Table();
		table.setWriteThrough(false);
		table.setEditable(true);
		table.setContainerDataSource(createContainer());

		final Form form = new Form();
		form.setWriteThrough(false);
		form.addField("Bean Table", table);
		mainWindow.addComponent(form);
		Button commitButton = new Button("Commit");
		commitButton.addListener(new ClickListener() {

			public void buttonClick(ClickEvent event) {
				System.out.println("Form is modified = " + form.isModified());
				System.out.println("Table is modified = " + table.isModified());
				System.out.println("Before commit: " + bean1.getName());
				form.commit();
				System.out.println("After commit: " + bean1.getName());
			}

		});
		mainWindow.addComponent(commitButton);
	}


	private Container createContainer() {
		BeanContainer<Object, Bean> container = new BeanContainer<Object, Bean>(
				Bean.class);

		container.setBeanIdResolver(new BeanIdResolver<Object, Bean>() {
			private static final long serialVersionUID = 1L;

			public Object getIdForBean(Bean bean) {
				return bean;
			}
		});
		bean1 = new Bean();
		container.addBean(bean1);
		return container;
	}

	public class Bean {

		private String name;

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}
	}
}

Output after 'beanname' is typed into the table and commit button is clicked:

Form is modified = false
Table is modified = false
Before commit: beanname
After commit: beanname

Any help would be appreciated!