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## Class: TouchBarSegmentedControl
> Create a segmented control (a button group) where one button has a selected state
Process: [Main ](../tutorial/quick-start.md#main-process )
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### `new TouchBarSegmentedControl(options)` _Experimental_
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* `options` Object
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* `segmentStyle` String - (optional) Style of the segments:
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* `automatic` - Default. The appearance of the segmented control is
automatically determined based on the type of window in which the control
is displayed and the position within the window.
* `rounded` - The control is displayed using the rounded style.
* `textured-rounded` - The control is displayed using the textured rounded
style.
* `round-rect` - The control is displayed using the round rect style.
* `textured-square` - The control is displayed using the textured square
style.
* `capsule` - The control is displayed using the capsule style
* `small-square` - The control is displayed using the small square style.
* `separated` - The segments in the control are displayed very close to each
other but not touching.
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* `mode` String - (optional) The selection mode of the control:
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* `single` - Default. One item selected at a time, selecting one deselects the previously selected item.
* `multiple` - Multiple items can be selected at a time.
* `buttons` - Make the segments act as buttons, each segment can be pressed and released but never marked as active.
* `segments` [SegmentedControlSegment[]](structures/segmented-control-segment.md) - An array of segments to place in this control.
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* `selectedIndex` Integer (optional) - The index of the currently selected segment, will update automatically with user interaction. When the mode is multiple it will be the last selected item.
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* `change` Function - Called when the user selects a new segment
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* `selectedIndex` Integer - The index of the segment the user selected.
* `isSelected` Boolean - Whether as a result of user selection the segment is selected or not.
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### Instance Properties
The following properties are available on instances of `TouchBarSegmentedControl` :
#### `touchBarSegmentedControl.segmentStyle`
A `String` representing the controls current segment style. Updating this value immediately updates the control
in the touch bar.
#### `touchBarSegmentedControl.segments`
A `SegmentedControlSegment[]` array representing the segments in this control. Updating this value immediately
updates the control in the touch bar. Updating deep properties inside this array **does not update the touch bar** .
#### `touchBarSegmentedControl.selectedIndex`
An `Integer` representing the currently selected segment. Changing this value immediately updates the control
in the touch bar. User interaction with the touch bar will update this value automatically.
