A problem with NO_VERTICAL_SCROLL when adding table

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Java

Mobile

Blackberry

public SimpleListScreen()
{
super(Manager.NO_VERTICAL_SCROLL);
setTitle("Simple List Demo");
add(new LabelField("My list", LabelField.FIELD_HCENTER));
add(new SeparatorField());
Manager mainManager = getMainManager();
SimpleList listField = new SimpleList(mainManager);
listField.add("Item 1");
listField.add("Item 2");
listField.add("Item 3");
}

I used above code to add a simple list in a blackberry eclipse project. But An error is occurred in Manager

(Manager mainManager = getMainManager();) and NO_VERTICAL_SCROLL in super(Manager.NO_VERTICAL_SCROLL);.

I don't know why there is no key word called NO_VERTICAL_SCROLL. If anybody knows the reason please let to me know. Thanks.