protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
var valuePickerLeft = PaddingLeft + (_combinedWidth - _valuePicker.MeasuredWidth) / 2;
var valuePickerTop = PaddingTop;
var valuePickerRight = valuePickerLeft + _valuePicker.MeasuredWidth;
var valuePickerBottom = valuePickerTop + _valuePicker.MeasuredHeight;
_valuePicker.Layout(valuePickerLeft, valuePickerTop, valuePickerRight, valuePickerBottom);
var unitLabelLeft = PaddingLeft + (_combinedWidth - _unitLabel.MeasuredWidth) / 2;
var unitLabelBottom = MeasuredHeight - PaddingBottom;
var unitLabelTop = unitLabelBottom - _unitLabel.MeasuredHeight;
var unitLabelRight = unitLabelLeft + _unitLabel.MeasuredWidth;
_unitLabel.Layout(unitLabelLeft, unitLabelTop, unitLabelRight, unitLabelBottom);
}