DropShadow Effect
Drop shadows can be used to make controls appear as though floating above their parent control. They can also be used to create a glow like effect, typically behind text, as seen in the title bar of an Aero theme Windows form.
Like scale and rotation, Dropshadow is a visual effect and does not alter the fundamental size of the control.
Controls with a DropShadow are clipped to ensure they fit within the bounds of their parent control.