How to restrict access to the model in a visual composer dc

Hi,

I have a VC with several views (Model) like create,approve etc.I have used these VC component in my CE BPM project, with each activity having a task which inturn calls a particular vc model.

I have a requirement where I need to restrict the visiblity of each model based on the role associated with an end user.For example create model should be visible to creator of the request and approver model should only be visble to the admin.

Please let me know how to control the visibility of the respective models based on the role associated with an end user.

thanks in advance....