[This is preliminary documentation and subject to change.]
This control displays a rectangle, possibly with some caption. It only serves as a visual element on the dialog to group other controls together.
Because of the way Windows draws this control, there is a gap between the top of the control's window and the visible frame, even when there is no caption.
There can be no property associated with this control.
Default
Position
Text
Visible
WindowHandle
None.
No.
The control is created as a "BUTTON" with the BS_GROUPBOX, WS_CHILD, WS_GROUP styles.