SegmentedButton.SelectedSegmentIndex
From Xojo Documentation
Property (As Integer )
aSegmentedButton.SelectedSegmentIndex = newIntegerValue
or
IntegerValue = aSegmentedButton.SelectedSegmentIndex
New in 2019r2
Supported for all project types and targets.
or
IntegerValue = aSegmentedButton.SelectedSegmentIndex
New in 2019r2
Supported for all project types and targets.
Used to get or set the selected segment number. The first segment is numbered zero.
Notes
A value of -1 means no selection. SelectedSegmentIndex may be set using the Properties pane to set the default value of the SegmentedButton control. SelectedSegmentIndex is only useful when SelectionStyle is set to Single. SelectedSegment will provide you with the Segment for the selected segment.
If SelectionStyle is set to Multiple, you must use SegmentAt to check each segment's Selected property to see if it's True or not.
Example
The following example changes the selected segment to the third segment:
SegmentedButton1.SelectedSegmentIndex = 2