Inheritance / Polymorphism

Question

Hi, I would like to know how to add a variable to collection or list in a inheriated class.
Any help would be much appreciated.

This is what I would to use it in

class MyGrid : DataGridView

{

    // Code to add the enum MyStyle to the Columns Collection, calling it DisplayStyle

    private void PaintCell(object sender, DataGridViewCellPaintingEventArgs e)

    {

        if (this.Columns[e.ColumnIndex].DisplayStyle == MyStyle.Currency)

        {

            // code here

        }

    }

    enum MyStyle

    {

        Currency, Accounting, Other

    }

}