Security in HFM Task Lists

Is it possible to control which tasks in a Task List a user can see with security?

It seems that if you put security on the Task List folder the Taks List will not be visible to the user if he does not have access to the specific security class. But if you have a Task List with Data Forms with different security classes the user will be able to see all Data Forms in the Task List but not being able to open the Data Forms that has a security class that the user does not have access to.