Big problem with JFormattedTextField.

When I use a JFormattedTextField to receive on input just letters when the JFormattedTextField loses focus it just clear the field! Why that?

try{

MaskFormatter mask =new MaskFormatter("?");

mask.setValidCharacters("abcdefghijklmnopqrstuvxwyzABCDEFGHIJKLMNOPQRSTUVXWYZ");

nameText =new JFormattedTextField(mask);

}

catch(ParseException pe){

}

When the JTextFormattedTextField loses the focus it gets empty. Why?

And I have another important question: Besides letters, I need to receive empty spaces on my JFormattetTextField. How can I set this on setValidCharacters method?

Thanks!

[942 byte] By [coffee95a] at [2007-11-27 1:41:34]