By default, the AllowScrollWheelSurface property is True. The AllowScrollWheelSurface property enables or disables scrolling the control while rotating the mouse wheel. The user can scroll vertically the surface by rotating the wheel up and down. If keeping the CTRL key down, the user can scroll horizontally the surface by rotating the wheel up and down. The AllowZoomWheelSurface property specifies whether the control zooms the surface while rotating the mouse wheel.