WV_UNREALIZED

The frame is at the start of its initialize block, and its window has not yet been created (you cannot set the WindowVisibility attribute to this setting).

0

WV_VISIBLE

The window for the frame is open and appears on the screen (and is not an icon).

1

WV_INVISIBLE

The frame's window is invisible. To redisplay the window, set this attribute to WV_VISIBLE.

2

WV_ICON

The frame's window is displayed as an icon on the screen. To redisplay the window, set this attribute to WV_VISIBLE.

3