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

New in 2021r3

Supported for all project types and targets.

If True, the Container indicates that it has the focus with a ring around its border; if False, the appearance of the object does not change when it has the focus.

Setting this property to True has no effect on Windows or Linux. The default is True.