Cell Highlighing in WPF DataGrid

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C#

WPF

MVVM

DataGrid

My DataGrid is bound to an ObservableCollection<MyClass> called MyList.

public class MyClass
    {
        public string _column1 { get; set; }
        public string _column2 { get; set; }
        public string _column3 { get; set; }
        List<Tuple<int, int>> referencedCells1;
        List<Tuple<int, int>> referencedCells2;
        List<Tuple<int, int>> referencedCells3;
    }

I am displaying only _column1, _column2, _column3 on the data grid. The referencedCells1,2,3 are a list of (row,column) values which I must highlight if a cell is clicked. So for example if I click on the first cell(0,0) - then the program has to highlight the cells referred to by MyList[0].referencedCells1. How do I do this - I am free to make changes to the Class structures as well.