How to center horizontally some Controls?

Hello,

I wish to put some content into my BorderLayout and center it horizontally but it doest work (content if align to jeft).

//Create a layout instance for the login form
var oLayout = new sap.ui.commons.layout.AbsoluteLayout({width:"340px",height:"150px"});
oLayout.addStyleClass("CustomStyle"); //Add some additional styling for the border

var oLabel = new sap.ui.commons.Label({text:"User Name"});
var oNameInput = new sap.ui.commons.TextField({width:"190px"});
oLabel.setLabelFor(oNameInput);
oLayout.addContent(oLabel, {right:"248px",top:"20px"});
oLayout.addContent(oNameInput, {left:"110px",top:"20px"});

oLabel = new sap.ui.commons.Label({text:"Password"});
oPWInput = new sap.ui.commons.PasswordField({width:"190px"});
oLabel.setLabelFor(oPWInput);
oLayout.addContent(oLabel, {right:"248px",top:"62px"});
oLayout.addContent(oPWInput, {left:"110px",top:"62px"});

var oLoginButton = new sap.ui.commons.Button({text:"Login",width:"133px"});
oLoginButton.attachPress(function(){alert("Login with user name '"+oNameInput.getValue()+"' and password '"+oPWInput.getValue()+"'.")});
oLayout.addContent(oLoginButton, {left:"110px",top:"104px"});

(from SAPUI5 SDK - Demo Kit)

appLayout.createArea(sap.ui.commons.layout.BorderLayoutAreaTypes.center, oLayout);
appLayout.setAreaData(sap.ui.commons.layout.BorderLayoutAreaTypes.center, {
  contentAlign : "center",
  visible : true
});

Thanks for your help.

Anthony