WeifenLuo.WinFormsUI.Docking.DockPane.ValidateActiveContent C# (CSharp) Method

        internal void ValidateActiveContent()
        {
            if (ActiveContent == null)
            {
                if (DisplayingContents.Count != 0)
                    ActiveContent = DisplayingContents[0];
                return;
            }

            if (DisplayingContents.IndexOf(ActiveContent) >= 0)
                return;

            IDockContent prevVisible = null;
            for (int i = Contents.IndexOf(ActiveContent) - 1; i >= 0; i--)
                if (Contents[i].DockHandler.DockState == DockState)
                {
                    prevVisible = Contents[i];
                    break;
                }

            IDockContent nextVisible = null;
            for (int i = Contents.IndexOf(ActiveContent) + 1; i < Contents.Count; i++)
                if (Contents[i].DockHandler.DockState == DockState)
                {
                    nextVisible = Contents[i];
                    break;
                }

            if (prevVisible != null)
                ActiveContent = prevVisible;
            else if (nextVisible != null)
                ActiveContent = nextVisible;
            else
                ActiveContent = null;
        }

 private static void RefreshDockPane(DockPane pane)
 {
     pane.RefreshChanges();
     pane.ValidateActiveContent();
 }