如何在SAPUI5中水平对齐不同高度的sap.m.FlexBox项目？

var oFlexBox = new sap.m.FlexBox({
  direction: sap.m.FlexDirection.Row
});

var oItem1 = new sap.m.FlexBox({
  height: "100px",
  width: "100px",
  backgroundColor: "red"
});
oFlexBox.addItem(oItem1);

var oItem2 = new sap.m.FlexBox({
  height: "200px",
  width: "100px",
  backgroundColor: "blue"
});
oFlexBox.addItem(oItem2);

var oItem3 = new sap.m.FlexBox({
  height: "150px",
  width: "100px",
  backgroundColor: "green"
});
oFlexBox.addItem(oItem3);

oFlexBox.setAlignItems(sap.m.FlexAlignItems.Center);

oFlexBox.placeAt("content");