haxe
    private var __onClick:MouseEvent->Void;
    /**
     Utility property to add a single `UIEvent.CLICK` event
    **/
    @:dox(group = "Event related properties and methods")
    public var onClick(null, set):MouseEvent->Void;
    private function set_onClick(value:MouseEvent->Void):MouseEvent->Void {
        if (__onClick != null) {
            unregisterEvent(MouseEvent.CLICK, __onClick);
            __onClick = null;
        }
        registerEvent(MouseEvent.CLICK, value);
        __onClick = value;
        return value;
    }

    private var __onChange:UIEvent->Void;
    /**
     Utility property to add a single `UIEvent.CHANGE` event
    **/
    @:dox(group = "Event related properties and methods")
    public var onChange(null, set):UIEvent->Void;
    private function set_onChange(value:UIEvent->Void):UIEvent->Void {
        if (__onChange != null) {
            unregisterEvent(UIEvent.CHANGE, __onChange);
            __onChange = null;
        }
        registerEvent(UIEvent.CHANGE, value);
        __onChange = value;
        return value;
    }

haxe
    /**
     Utility property to add a single `UIEvent.CLICK` event
    **/
    @:event(MouseEvent.CLICK)       public var onClick:MouseEvent->Void;
    
    /**
     Utility property to add a single `UIEvent.CHANGE` event
    **/
    @:event(UIEvent.CHANGE)         public var onChange:UIEvent->Void;