private void button4_Click(object sender, EventArgs e)
{
this.Hide();
Caja NvoCaja = new Caja();
NvoCaja.Show();
}
//FUNCIÓN ABRIR MODULO CAJA
public void VentanaCaja(object v)
{
Form ventana = v as Form;
ventana.Close();
Caja NvaVentana = new Caja();
NvaVentana.Show();
}