DataPicker Validation

Hi... please tell me is there a way to make a Datapicker value
validation ?
When I enter wrong value datePicker changes it's style making
background red... so if DatePicker can recognise did I enter valid
value I think there will be also method to check that validation for
example on button click I wan't to know is the value is valid or
not...

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.