Neural Network + Control+Simulink

I've got three different models. I've obtained these math models based of a code using the Neural Network toolbox. Now that I've obtain these models, I want control strategies for them. So, using Simulink, how do I incorporate these models? If it can be done by code, how? Or, how I can I turn the "net" object to a "model"object to use as a block in Simulink?

Thanks