Simulink System Object Property - Variable sized properties in handle classes are not supported

Hi All

I have a Simulink System Object for which I created several properties. I set some of the properties in the constructor method and the model runs fine in Interpreted Mode. When I try to run in Code Generation mode I get the following error:

Variable sized properties in handle classes are not supported

This operation defines 'example.s' as unknown.'.

I am not sure where to start even. Any ideas will be appreciated.

Regards

Etienne