Language Reference Guide : System Classes : TreeviewField Class : EditLabel Method
 
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EditLabel Method
The EditLabel method puts the specified node in edit mode. The TreeviewField's AllowLabelEdit attribute must be TRUE. The method returns TRUE or FALSE.
This method has the following syntax:
rc = TreeviewField.EditLabel([node = TreeNode])
This method has the following parameter:
node
(Optional) Describes the node to be edited. If NULL, the currently selected node is the node to be edited.