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Property (As Boolean )
aDesktopListBox.AllowFocusRing = newBooleanValue
BooleanValue = aDesktopListBox.AllowFocusRing

New in 2021r3

Supported for all project types and targets.

If True, the control indicates when it has the focus by drawing a ring around its border. If False, the appearance of the control does not change when it has the focus.