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ABL Reference
Handle Attributes and Methods Reference : FIRST-COLUMN attribute

FIRST-COLUMN attribute

A handle to the first column in a browse widget, regardless of the value of its READ-ONLY attribute or its VISIBLE attribute.
Data type: HANDLE
Access: Read-only
Applies to: BROWSE widget
After finding the first column, accessing the NEXT-COLUMN attribute of the current column allows you to walk through the browse columns.