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ABL Reference
Handle Attributes and Methods Reference : CONTROL-BOX attribute
 

CONTROL-BOX attribute

(Windows only)
Indicates whether the window has a system menu box in its caption bar.
Data type: LOGICAL
Access: Readable/Writable
Applies to: WINDOW widget
In character interfaces, this attribute has no effect.
The CONTROL-BOX attribute must be set before the window is realized. The default value is TRUE.