7.4.0 DatePopup problem

Hi,
I’ve noticed a problem on the popupDatefield.
In order to reproduce,
create a popupdatefield i.e. like this.

clientDetailsDOBpopupDateField.setInvalidAllowed(false);
clientDetailsDOBpopupDateField.setDateFormat(“dd/MM/yyyy”);
clientDetailsDOBpopupDateField.setInputPrompt(“(dd/MM/yyyy)”);

Click on the ‘calendar’ icon, the calendar appears, without clicking on a date, click inside the textfield (where you write your date). The popup disapears and now you write on the 'Input Prompt" rather on the ‘date’ textfield, meaning that whatever you write here is not taken into account.

This also happens on the vaadin sampler here
http://demo.vaadin.com/sampler/#ui/data-input/dates/popup-date-field
(just put a ‘test’ value on the input prompt).
I don’t think I had this problem in vaadin 7.3.10…