Window.alert cannot be launched after making an ajax call

Hi,

I am trying to display a status after making an ajax call, the
following is the code fragment.

submitButton.addClickHandler(new ClickHandler() {

public void onClick(ClickEvent event) {
// TODO Auto-generated method stub;
for(int i = 0 ; i < ageBoxes.length ; i++) {
ageBoxes[i].validate(); //ajax call
}

Window.alert("Finished!");
}

});

submitButton is a button. ageBoxes is an array of TextBox. When the
submit button is clicked, this click handler will be triggered and
make ajax call(validate) for all the TextBox. The ajax call can be
triggered successfully, however, the Window message box cannot be
launched for some reasons.

Can anyone give me ideas why the message box cannot be popped up after
making a series of ajax call?

Thanks

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