ListBox.UseFocusRing

From Xojo Documentation

Property (As Boolean )
aListBox.UseFocusRing = newBooleanValue
or
BooleanValue = aListBox.UseFocusRing

Supported for all project types and targets.

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