ActionScript 3 :: Access List / DataProvider From Custom CellRenderer

The code below sets up a List object in the main controller class that uses a custom cell renderer (CustomListCell class). the CustomListCell class creates a Button object for the cell that will be used to delete itself from the List's DataProvider. How can I properly access the parent List object from its custom cell renderer?

//Controller Class
private function createList():void {
provider = new DataProvider(data);
list = new List();
list.width = 200;
list.height = 400;
[Code] .....