TextField input Prompt problem with ReadOnly(true)

Problem with Vaadin 6.4.2. with TextField Component, when i set
Input Prompt
message and
property set to
then i don’t see inputPrompt message in Textfield component, in previous version (Vaadin 6.3) TextField component with this same properties showed me InputPrompt. This problem is releated ofcorse with ReadOnly property, i check with source
(only in TextField) but i don’t find anything, a think that this issue is maybe more deep inside the vaadin.

Could yo give mi a simply and quickly answer to resolve my problem