There are multiple ways to unlock a LabVIEW class. To unlock the class try the following methods:
- Unload the class from the second application instance. This action should unlock the class for editing in the first application instance.
- Delete the control of the class in the second application instance and save the VI.
- Close the second application instance. This action allows the class to leave the memory and unlocks the class for editing in the first application.
- Close your project and open the class direclty outside of the project. Then save the class and reopen the project.
If you are using a Real Time system, the class will become locked if it is referenced both under My Computer and the RT Target. In order to unlock the class, make sure that the class is not referenced under multiple targets.