Scrollbar documentation

# Scrollbar

Scrollbar inherits from FormObject and defines instance variables immediate, inhibitUpdate. It has no subclasses.

If 'immediate' is true, the scroll value is continuously updated as the user holds the pen down. If it is false, the scroll value is updated once, when the pen is lifted.

## Methods defined in Scrollbar:

### Methods for accessing:

- immediate

### Methods for initialization:

- initialize
- reallyAcquireModel

### Methods for updating:

- scrollTo: value oldValue: oldValue
- updateFromModel

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