4. System Classes : ActiveField Class : DropObject Attribute
 
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DropObject Attribute
Data Type: varchar(32)
4GL Access: RW
The DropObject attribute holds the class name of the objects that can be dropped on the field. If DropObject is not set (that is, has an empty string), the field accepts no drops.
The DropObject attribute is not displayed in the Property Inspector because it must be set at runtime, that is, the attribute must be set in the frame script.