如何实现带点击按钮回调的自定义弹窗？

@Entry
@Component
struct Index {
  //声明弹窗controller
  dialogController: CustomDialogController = new CustomDialogController({
    builder: MyDialog({
      onConfirm: () => {
        //点击确认按钮回调
      }, onCancel: () => {
        //点击取消按钮回调
      }
    }),
    alignment: DialogAlignment.Bottom,
    offset: { dx: 0, dy: "-20vp" }
  })

  build() {
    Column() {
      Button("点我").onClick(() => {
        //点击按钮，弹出弹窗
        this.dialogController.open()
      })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}

//自定义弹窗
@CustomDialog
struct MyDialog {
  controller: CustomDialogController = new CustomDialogController({
    builder: MyDialog(),
  })
  onConfirm?: () => void
  onCancel?: () => void
  build() {
    Row({ space: 20 }) {
      Button("确认").onClick(() => {
      })
      Button("取消").onClick(() => {
      })
    }.padding(20)
  }
}