Change the default car dock app
Follow these instructions to reset the default “car mode” app on your device:
1) From the main home screen press menu –> settings –> manage applications
2) Pick the app that currently launches when you dock your phone (or start car mode)
3) now press Clear Defaults.
4) The next time you dock your phone you should be presented a list of Car Mode apps.
5) Pick the one that you want to launch (please pick CarHome Ultra!)
6) If you don’t want to see this dialog every time you dock, check the box called Make Default.