Use a form level variable in object Paint method

I have a datagridview , to which I add specialized buttons, including override the paint method.

But I now have the scenario where users want to 'tag' the cells of the dgv with color depending upon a s=user selection.

Currently I clear the dgv and reload buttons using a new object property _Highlight but that takes about 15secs.

Is there a useful way of passing the user selection across to the button class or can I override the Paint event of the DGV , to keep all the presentation code in the same class ?

/// <summary>
    /// Provides a specialised button that displays a depressed button and shows if multiple values available
    /// </summary>
    public class IssueRevButton : DataGridViewButtonCell
    {
        private bool _IsSelected;
        private bool _MultiValues;
        private int _Highlight;

       protected override void Paint(
                Graphics graphics, Rectangle clipBounds, Rectangle cellBounds,
                int rowIndex, DataGridViewElementStates elementState, Object value, Object formattedValue,
                string errorText,
                DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts  )
        {

            Color forgCol = cellStyle.ForeColor;
            Color backCol;
            PushButtonState pbState = PushButtonState.Normal;
            switch (_Highlight)
            {
                case 1:
                    backCol = Color.CornflowerBlue;   //Chartreuse = light green; aliceblue>>white
                    break;
                case 2:
                    backCol = Color.AliceBlue;
                    break;
                case 0:
                default:
                    backCol = Color.BurlyWood;
                    break;
            }
////////////

///form display code

                        //replace default textbox cell with ButtonCell
                        GridDocs.Rows[rowid].Cells[i] = new IssueRevButton(rd.Files.Count > 1, highlightit);

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