private void tablaPrincipal_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            int           columnIndex    = e.ColumnIndex;
            List <string> columnElements = new List <string>();

            foreach (DataGridViewRow row in tablaPrincipal.Rows)
            {
                if (row.Cells[columnIndex].Value != null)
                {
                    columnElements.Add(row.Cells[columnIndex].Value.ToString());
                }
            }

            StatisticAnalysisForm analysis = new StatisticAnalysisForm(columnElements, tablaPrincipal.Columns[e.ColumnIndex].Name, valores, atributos, columnIndex, this);

            this.Hide();
            analysis.Show();
        }
 private void regresar_Click(object sender, EventArgs e)
 {
     anterior.Show();
     this.Close();
 }