Language Reference Guide : System Classes : FrameSource Class : IsPopup Attribute
 
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IsPopup Attribute
Data Type: smallint
4GL Access: RW
If the IsPopup attribute is TRUE, the frame is displayed as a pop-up window. Possible values are TRUE and FALSE.
A pop-up always displays on top of its parent window and is automatically minimized when its parent is minimized and restored when its parent is restored.
A pop-up does not appear in the task bar.