HarmonyOS Toggle问题，如何使用代码改变Toggle 的状态，或者拦截Toggle开关的改变

@Entry 
@Component 
struct ToggleExample { 
  @State openShow:boolean=false 
  build() { 
    Column({ space: 10 }) { 
      Text('type: Switch').fontSize(12).fontColor(0xcccccc).width('90%') 
      Flex({ justifyContent: FlexAlign.SpaceEvenly, alignItems: ItemAlign.Center }) { 
        Toggle({ type: ToggleType.Switch, isOn: $$this.openShow }) 
          .selectedColor('#007DFF') 
          .switchPointColor('#FFFFFF') 
          .onChange((isOn) => { 
            if(isOn){ 
              AlertDialog.show({ 
                title: '用户确认是否开启', 
                message: 'text', 
                buttons:[ 
                  { 
                    value: '确认', 
                    action: () => { 
                      console.info('Callback when button1 is clicked') 
                    } 
                  }, 
                  { 
                    value: '取消', 
                    action: () => { 
                      this.openShow=false 
                    } 
                  }, 
                ] 
              }) 
 
            } 
          }).hoverEffect(HoverEffect.None) 
      } 
    }.width('100%').padding(24) 
  } 
}