HarmonyOS RelativeContainer的居中问题

RelativeContainer() { 
  Row().width(100).height(100) 
    .backgroundColor("#FF3333") 
    .alignRules({ 
      top: {anchor: "__container__", align: VerticalAlign.Center}, 
      left: {anchor: "__container__", align: HorizontalAlign.Center} 
    }) 
    .id("row1") 
    .margin({top: -50, left: -50}) 
} 
.width(300).height(300) 
.margin({left: 50}) 
.border({width:2, color: "#6699FF"})