CS_DROPSHADOW top-level constant
int
const CS_DROPSHADOW
Enables the drop shadow effect on a window. The effect is turned on and off through SPI_SETDROPSHADOW. Typically, this is enabled for small, short-lived windows such as menus to emphasize their Z-order relationship to other windows. Windows created from a class with this style must be top-level windows; they may not be child windows.
Implementation
const CS_DROPSHADOW = 0x00020000;