通过bindContentCover显示全屏模态页面，弹出后需要用手势返回的话，怎样监听到手势返回事件

Button("transition modal 2") 
.margin(10) 
.fontSize(20) 
.onClick(()=>{ 
this.isShow2 = true; 
}).bindContentCover(this.isShow2, this.myBuilder2(), {modalTransition: ModalTransition.NONE, backgroundColor: Color.Orange, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})
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