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

        internal void SetIsActiveDocumentPane(bool value)
        {
            if (m_isActiveDocumentPane == value)
                return;

            m_isActiveDocumentPane = value;
            if (DockState == DockState.Document)
                RefreshChanges();
            OnIsActiveDocumentPaneChanged(EventArgs.Empty);
        }

            private void SetActiveDocumentPane()
            {
                DockPane value = null;

                if (ActivePane != null && ActivePane.DockState == DockState.Document)
                    value = ActivePane;

                if (value == null && DockPanel.DockWindows != null)
                {
                    if (ActiveDocumentPane == null)
                        value = DockPanel.DockWindows[DockState.Document].DefaultPane;
                    else if (ActiveDocumentPane.DockPanel != DockPanel || ActiveDocumentPane.DockState != DockState.Document)
                        value = DockPanel.DockWindows[DockState.Document].DefaultPane;
                    else
                        value = ActiveDocumentPane;
                }

                if (m_activeDocumentPane == value)
                    return;

                if (m_activeDocumentPane != null)
                    m_activeDocumentPane.SetIsActiveDocumentPane(false);

                m_activeDocumentPane = value;

                if (m_activeDocumentPane != null)
                    m_activeDocumentPane.SetIsActiveDocumentPane(true);
            }