Hiding Tab

hideTab.cs

using System.Collections.Generic;
using System.Linq;
using Erp.UI.App.CustomerTracker; // or Erp.UI.App.CustomerEntry when in Customer entry form
using Infragistics.Win.UltraWinDock;

CustomerDock customerDock = (CustomerDock)csm.GetNativeControlReference("197d7d6d-2443-47c7-b8ef-aa6cd9a95267");
DockableControlPane taxCertCustomerTab = customerDock.baseDockManager.ControlPanes
  .Cast<DockableControlPane>()
  .Where(x => x.TextTab == "Tax Certification")
  .FirstOrDefault();
taxCertCustomerTab.Close();