If you want to hide the scroll bars, set the ScrollBarH and ScrollBarV properties to 2 (Hide).
If you want to display the scroll bars at all times, set the ScrollBarH and ScrollBarV properties to 0 (Show).
If you want to specify how far the page scrolls when you click the scroll arrows or move the scroll box on the horizontal and vertical scroll bars, specify the number of units (in twips) the page scrolls with the ScrollIncH and ScrollIncV properties.