private void fillSelectedWithRandomNumbersToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewCell cell in dgvShapeData.SelectedCells)
            {
                switch (cell.ColumnIndex)
                {
                case 6:
                    cell.Value = XF.Random(0, 255);
                    break;

                case 8:
                case 9:
                    cell.Value = XF.Randomf();
                    break;

                default:
                    cell.Value = XF.Random();
                    break;
                }
            }
        }