private void cmdAceptar_Click(object sender, EventArgs e)
 {
     if (rboOP.Checked == true)
     {
         Oficinas_Principales OP = new Oficinas_Principales();
         OP.Show();
         this.Hide();
     }
     if (rboUR.Checked == true)
     {
         Unidad_Responsable UR = new Unidad_Responsable();
         UR.Show();
         this.Hide();
     }
     if (rboHistorial.Checked == true)
     {
         Historial Historial = new Historial();
         Historial.Show();
         this.Hide();
     }
     if (rboInsertar.Checked == true)
     {
         Insertar insertar = new Insertar();
         insertar.Show();
         this.Hide();
     }
     if ((rboOP.Checked == false) && (rboUR.Checked == false) && (rboHistorial.Checked == false) && (rboInsertar.Checked == false))
     {
         MessageBox.Show("Tienes que seleccionar uno", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
     }
 }
        private void cmdLimpiar_Click(object sender, EventArgs e)
        {
            Historial historial = new Historial();

            historial.ResetMouseEventArgs();
            cboArea.Text   = "";
            cboEstado.Text = "";
            cboTipo.Text   = "";
            dateTPHistorial.ResetText();
            dateTPHistorial.Enabled = true;
            cboArea.Enabled         = true;
            cboTipo.Enabled         = true;
            cboEstado.Enabled       = true;
        }