Expansion tile Expand and collapse

[rishabh singh]

I have 4 expansion tiles and each of them has there ListTile as children and I want only one open at a time If the user click on 1st tile its expand and when the user clicks on 2nd expansion tile the 1st one should close? any idea?

[Belokotov]

List to be stafull with property wich panel is expanded. On an change state of his children update state of the parent last of the property with reference to the child

[rishabh singh]

didn't get the clear picture can you little bit explain?