JavaFX SDK installer does not overwrite a previous JavaFX Runtime installation

Use case:
1. Install JavaFX 2.1 SDK Developer Preview (build b07)
2. Uninstall the JavaFX 2.1 SDK. The JavaFX 2.1 Runtime remains on the system
3. Install the JavaFX 2.0.2 SDK. The 2.0.2 SDK is installed, but the 2.1 Runtime is not overwritten

Note: the reverse scenario (install then uninstall 2.0.2 SDK, install 2.1 SDK b07) provides the expected results, i.e. the Runtime is updated to 2.1