Language Reference Guide : 4. System Classes : FieldObject Class : ControlField Attribute
 
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ControlField Attribute
Data Type: smallint
4GL Access: RW
The ControlField attribute determines whether a field is intended for manipulating the user interface rather than the underlying data. A control field plays no part in determining an ancestor's HasDataChanged value.
Valid values are TRUE or FALSE.
Default: FALSE
Control buttons and viewport fields are two fields for which you might set this attribute to TRUE.