public Pane GetPaneFromContent(DockableContent content)
        {
            if (AttachedPane != null && AttachedPane.Contents.Contains(content))
            {
                return(AttachedPane);
            }

            if (FirstChildGroup != null)
            {
                Pane pane = FirstChildGroup.GetPaneFromContent(content);
                if (pane != null)
                {
                    return(pane);
                }
            }

            if (SecondChildGroup != null)
            {
                return(SecondChildGroup.GetPaneFromContent(content));
            }

            return(null);
        }