The WM_MDICASCADE message is sent to a multiple document interface (MDI) client window to arrange all its child windows in a “cascade” format.
wParam
Specifies a cascade flag. Currently, only the following flag may be specified:
| Value | Meaning |
| MDITILE_SKIPDISABLED | Prevents disabled MDI child windows from being tiled. |
lParam
This parameter is not used.