From Xojo Documentation
| This item was deprecated in version 2019r2.
Please use SegmentedButton.SelectionStyles as a replacement.
Property (As Integer )
Controls the number of segments that can be selected at the same time.
|0||Single||The SegmentedControl behaves as a group of RadioButtons. One one is selected, the others are automatically deselected.|
|1||Multiple||The buttons behave as a series of Checkboxes. Two or more can be selected at the same time.|
|2||None||Each button behaves like a PushButton. When a segment is clicked, it is depressed (highlighted) only for the duration of the click.|