how to gray out subgrids?

I am working on case entity and I have a subgrid in it which opens a task form. I want to make the subgrid read only or gray out or take off the + button so that users cannot add a task record when a case is closed.
How can we make this possible in crm 2013? What are the other options I can make use of in Case entity?
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Feridun KadirConnect With a Mentor Principal ConsultantCommented:
I don't think you can do that without resorting to unsupported JavaScript (and I don't know how to do it).  You can make the sub-grid invisible when the case is closed but that I think is not what you want.
huntergamesAuthor Commented:
Yes, that is not what I want and I don't think I want to go in an unsupported way either. Anyways I will think of remodeling my scenario as that is the only option I am left with.
Thanks for the response Feridun,
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