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Read-Only Property (As Integer )
IntegerValue = aDesktopListBox.LastColumnIndex

New in 2021r3

Supported for all project types and targets.

The number of the last column of the DesktopListBox. Because (like nearly all of Xojo) the DesktopListBox is zero-based, this value will be 1 less than the DesktopListBox.ColumnCount.