1. Press home key and let the default home start
2. Long press search key to launch the Power Strip (or use the launcher in you application drawer to start it)
3. Invoke the context menu (click the context button, or long press somewhere outside the strip, or choose "context" in the menu)
4. Select "Application info"
5. Click the "clear default" button on the application info page of your default home app
6. Press the home key again, and you should have the chooser available