I have an IFM plug-in that looks at heads and pressures and calculates a result when manually activated.

If I load the plug-in before running the model, it is also attached to the DAC and I can activate it to do my my calculation.

However, if I don't attach it to the FEM before running the model, I can't use it. When viewing the DAC file I can't attach new plug-ins.

This plug-in only uses the callback OnActivate, and so shouldn't need to be attached during the model run. I would like to be able to use my plug-in to process old model files without re-running the models. How can I attach my plug-in to existing DAC files?