Reset ringtone picker preferences
You can use Handcent app as the default ringtone picker. To set Handcent as default ringtone picker, go to


  Settings | Applications | Manage Applications | All | Android System
  (Sound picker for SE phones)


Click 'Clear Defaults' button. 



After this, When you are choosing a ringtone, You will be presented with a dialog box asking you to select one of the application as ringtone picker. Enable the 'Use by default for this action' Check-box and select Handcent. This will set Handcent as your default ringtone picker.