InfoPath Dev

Second textbox copy form First textbox. But sometime i need to change the second textbox value differ from the first textbox. It always display the value from the first textbox. It must display new value if i overwrite in the second textbox.  Thanks.

I have a inofpath-form 2007. One the first view is that several of controls... And a textbox. One the second view I need to have the text from the first textbox into one another textbox. In the second textbox the user also need to change some text in the box. Did anybody have some rule for that?   Thanks in advance!