Language Reference Guide : 4. System Classes : TreeNode Class : IsDropNode Attribute
 
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IsDropNode Attribute
Data Type: integer
4GL Access: RW
If the IsDropNode attribute is set to TRUE and a DropObject is defined for the TreeviewField containing this node, then the node can be dropped on and the cursor will indicate this. If the IsDropNode attribute is FALSE, the node cannot be dropped on and the cursor will indicate this.
Note:  If the drag-and-drop operation ends with a drop over a node with IsDropNode set, then the TriggerField will be the TreeviewField over which the drop occurred, and the node being dropped on will become the CurNode of that TreeviewField.
The default for IsDropNode is TRUE for nodes if the TreeviewField has a DropObject defined.