Change Background Color

Hi,

I am using toggle visibility feature in one of my reports and I am trying to change the background color of some cells when I toggle the view. Please help, any help will be appreciated.

Thanks,

-Rohit

To be more precise, there is a parent and it has several children. At first children are hidden, but when I click parent then children become visible. I would like to change the color of the parent when children are visible and go back to transparent when children are hidden. I hope I clearly discribe my question. Thanks.