System.Windows.Forms.CustomTabControl.GetTabRow C# (CSharp) Method

        public int GetTabRow(int index)
        {
            //	All calculations will use this rect as the base point
            //	because the itemsize does not return the correct width.
            Rectangle rect = this.GetTabRect(index);

            int row = -1;

            switch (this.Alignment) {
                case TabAlignment.Top:
                    row = (rect.Y - 2)/rect.Height;
                    break;
                case TabAlignment.Bottom:
                    row = ((this.Height - rect.Y - 2)/rect.Height) - 1;
                    break;
                case TabAlignment.Left:
                    row = (rect.X - 2)/rect.Width;
                    break;
                case TabAlignment.Right:
                    row = ((this.Width - rect.X - 2)/rect.Width) - 1;
                    break;
            }
            return row;
        }