The Control class comes with two predefined parts: VScrollBar and HScrollBar. These two parts represent the vertical and horizontal scroll bars that sometimes appear in a control such as a list box or text field.
To refer to these parts, you specify the control and then the part, separated by the dot operator, and then call the method on the part. For example:
TextEditor.Document.VScrollBar.ScrollByLine (10)
The methods and properties for these parts are the same as the methods and properties for the ScrollBar class.