BasicSelectBoxBehavior
constructor( display: Display, textMetrics: TextMetrics, backgroundColor: Color, darkBackgroundColor: Color, foregroundColor: Color, cornerRadius: Double, buttonWidth: Double = 20.0, focusManager: FocusManager? = null, popupManager: PopupManager? = null, buttonA11yLabel: String? = null, inset: Double = 4.0)(source)