ComCtrls

Use TPageScroller to define a display area for a narrow window, such as a toolbar. 

If the window is larger than the display area, TPageScroller attaches arrows to the edges of the window, allowing it to be scrolled within the display area. 

The page scroller control is similar to the scroll box control. However, the page scroller provides arrows that extend over the edges of the display area, whereas the scroll box provides scroll bars. Also, the page scroller supports scrolling for only one orientation (horizontal or vertical), so the constrained window must fit either the width or height of the display area.