HarmonyOS 鸿蒙Next关于menu组件，子菜单不显示

从官网上复制的测试文档，不显示子菜单。(https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V2/ts-basic-components-menu-0000001493903960-V2)

API9 deveco版本：

@Entry
@Component
struct Cs009 {
@State select: boolean = true
private iconStr: ResourceStr = $r(“app.media.icon”)
private iconStr2: ResourceStr = $r(“app.media.icon”)

@Builder
SubMenu() {
Menu() {
MenuItem({ content: “复制”, labelInfo: “Ctrl+C” })
MenuItem({ content: “粘贴”, labelInfo: “Ctrl+V” })
}
}
@Builder
MyMenu(){
Menu() {
MenuItem({ startIcon: $r(“app.media.icon”), content: “菜单选项” })
MenuItem({ startIcon: $r(“app.media.icon”), content: “菜单选项” })
.enabled(false)
MenuItem({
startIcon: this.iconStr,
content: “菜单选项22”,
endIcon: $r(“app.media.icon”),
builder: this.SubMenu.bind(this)
})
MenuItemGroup({ header: ‘小标题’ }) {
MenuItem({ content: “菜单选项” })
.selectIcon(true)
.selected(this.select)
.onChange((selected) => {
console.info(“menuItem select” + selected);
this.iconStr2 = $r(“app.media.icon”);
})
MenuItem({
startIcon: $r(“app.media.icon”),
content: “菜单选项”,
endIcon: $r(“app.media.icon”),
builder: this.SubMenu.bind(this)
})
}
MenuItem({
startIcon: this.iconStr2,
content: “菜单选项”,
endIcon: $r(“app.media.icon”)
})
}
}
build() {
Row() {
Column() {
Text(‘click to show menu’)
.fontSize(50)
.fontWeight(FontWeight.Bold)
}
.bindMenu(this.MyMenu)
.width(‘100%’)
}
.height(‘100%’)
}
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

官方示例效果：

测试效果，模拟器和预览器都不显示子菜单，点击菜单效果截图：

请各位有空帮忙看下，拜谢！