When you upgrade the OS to the Solaris 10 6/06 or Solaris 10 11/06 release, the input method framework and individual input methods get upgraded from rev.10 to rev.12. However, ChuYin is not in the list of supported input methods. Also, you cannot use the function keys F2 and F3 to switch methods
Workaround: Use PinYin to type traditional Chinese characters with Hanyu PinYin. Use Ctrl+Shift to switch input methods.