You need to implement 1Hz watchface (onPartialUpdate) support. I can't seem to find the documentation right now, but the Analog sample app is a pretty good resource.
If you're using the 3.2.1 or later SDK, you need to import the project from one of the SDK folders in %APPDATA%\Garmin\ConnectIQ\Sdks and take a peek around.
It's in the SDK samples directory. In eclipse. go to ConnectIQ>samples. On windows with 3.2.x or greater, SDKs are in \users\(you)\appdata\roaming\garmin\ConnectIQ\sdks.
