private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
comboBox2.Items.Clear();
Pis = Datos.ObtenerPInteres(comboBox1.SelectedIndex + 1, Pi[selected].Tabla);
if (Pis != null)
{
foreach (PostgresDataAccess.PInteres pi in Pis)
{
comboBox2.Items.Add(pi.Nombre);
}
}
}