RDLC Report Column Visibility Problem in Group By

I have an rdlc report in asp.net. I have a table in it and I am using group by in that开发者_高级运维 table. But the columns which I make Parent Group or child group has Column Visibility Disabled.

Notes Column is in a group. See its visibility option is disabled.

How can I hide that column on the basis of a criteria as I can do with the Exam Date column that is not in any group. Please help.

---

I've concluded that it's not possible to do this.