System.Windows.Forms.TabControl.UpdateTabSelection C# (CSharp) Method

		protected void UpdateTabSelection (bool updateFocus)
		{
			ResizeTabPages ();
		}

            public override void Add(Control value)
            {
                if (!(value is TabPage))
                {
                    throw new ArgumentException(string.Format(SR.TabControlInvalidTabPageType, value.GetType().Name));
                }

                TabPage tabPage = (TabPage)value;

                // See InsertingItem property
                if (!_owner.InsertingItem)
                {
                    if (_owner.IsHandleCreated)
                    {
                        _owner.AddTabPage(tabPage);
                    }
                    else
                    {
                        _owner.Insert(_owner.TabCount, tabPage);
                    }
                }

                base.Add(tabPage);
                tabPage.Visible = false;

                // Without this check, we force handle creation on the tabcontrol
                // which is not good at all of there are any OCXs on it.
                if (_owner.IsHandleCreated)
                {
                    tabPage.Bounds = _owner.DisplayRectangle;
                }

                // Site the tabPage if necessary.
                ISite site = _owner.Site;

                if (site != null)
                {
                    ISite siteTab = tabPage.Site;
                    if (siteTab == null)
                    {
                        site.Container?.Add(tabPage);
                    }
                }

                _owner.ApplyItemSize();
                _owner.UpdateTabSelection(false);
            }