SegmentedButton.AddSegmentAt
From Xojo Documentation
Method
SegmentedButton.AddSegmentAt(index as Integer, segment as Segment)
New in 2019r2
Supported for all project types and targets.
New in 2019r2
Supported for all project types and targets.
Creates a new segment at index (moving the existing segments over).
Example
The following example adds a segment at the 4th position.