4. System Classes : TreeviewField Class : HasRootLine Attribute
 
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HasRootLine Attribute
Data Type: integer
4GL Access: RW
If the HasRootLine attribute is set to TRUE, there is a line at the root node level—but only if the HasLines attribute (see HasLines Attribute) is also set to TRUE. If this attribute is set to FALSE, no +/- button is displayed at the root.