Programmatically laying out vertical SeekBar objects

Question

The purpose of the following function (in an Android app) is to programmatically lay out three vertical SeekBar objects one beside the other.

The setting for the constaints is a bit tricky, but the most difficult part for me here is to get the verticality of the bars. I use rotation = 270.0F, but the rotation is ignored as soon as I set constaints up. Can anybody tell me why this is happening?

fun setAdjustBars() {
    val clrSetBarR = SeekBar(this)
    val clrSetBarG = SeekBar(this)
    val clrSetBarB = SeekBar(this)

    clrSetBarR.thumbTintList = ColorStateList.valueOf(Color.rgb(255,0,0))
    clrSetBarG.thumbTintList = ColorStateList.valueOf(Color.rgb(0,255,0))
    clrSetBarB.thumbTintList = ColorStateList.valueOf(Color.rgb(0,0,255))

    val sideColrVal = 77
    clrSetBarR.progressTintList = ColorStateList.valueOf(Color.rgb(255,sideColrVal,sideColrVal))
    clrSetBarG.progressTintList = ColorStateList.valueOf(Color.rgb(sideColrVal,255,sideColrVal))
    clrSetBarB.progressTintList = ColorStateList.valueOf(Color.rgb(sideColrVal,sideColrVal,255))

    val seekBarsArray = arrayOf(clrSetBarR,clrSetBarG,clrSetBarB)
    seekBarsArray.map {
        it.id = View.generateViewId()
        it.rotation = 270.0F
        constraintLayout?.addView(it)
        constrSet.connect(it.id, ConstraintSet.TOP, deviceFrameID, ConstraintSet.TOP)
        constrSet.connect(it.id, ConstraintSet.BOTTOM, deviceFrameID, ConstraintSet.BOTTOM)
        constrSet.connect(it.id, ConstraintSet.LEFT, deviceFrameID, ConstraintSet.LEFT)
        constrSet.connect(it.id, ConstraintSet.RIGHT, deviceFrameID, ConstraintSet.RIGHT)
    }

    val sideShift = 170
    //constrSet.setMargin(clrSetBarR.id, ConstraintSet.RIGHT,sideShift)
    //constrSet.setMargin(clrSetBarB.id, ConstraintSet.LEFT,sideShift)

    constrSet.setMargin(clrSetBarG.id, ConstraintSet.LEFT,sideShift)
    constrSet.setMargin(clrSetBarB.id, ConstraintSet.LEFT,sideShift*2)

    /*
    When using this code the 3 bars appears one after the other from top to bottom.*/
    constrSet.setMargin(clrSetBarR.id, ConstraintSet.TOP,-sideShift)
    constrSet.setMargin(clrSetBarB.id, ConstraintSet.BOTTOM,-sideShift)
    // */

    constrSet.applyTo(constraintLayout)
}