This issue is related to issue 212399. There is no way to customize required JavaFX runtime version for JavaFX project. It is worth property to add just like we have JDK source/target version level.
fixed in jetmain
Integrated into 'main-golden', will be available in build *201303232300* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Petr Somol <firstname.lastname@example.org>
Log: #212400 - Allow to select required JavaFX runtime version