Language Reference Guide : System Classes : TableField Class : ControlButton Attribute
 
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ControlButton Attribute
Data Type: ControlButton
4GL Access: RW
The ControlButton attribute indicates which control button object is associated with a given table field. The control button object contains the named table field's menu operations.
This attribute is null if the table field has no menu or if the table field is an unconverted table field with an old-style operations menu.
If a table field does not currently contain a control button, to add one you must specify an existing object of the control button class. The syntax for adding a control button object to a table field is:
field(tblfld).ControlButton = control_button;
For more information about using the ControlButton attribute, see the Programming Guide.