When executing ContentPaneCommands.Close, the handler for the closing event of the pane can cancel the event.  I need to know if there is a way to dig out the cancellation of that event from the code that executes ContentPaneCommands.Close, which returns a boolean that is not related to cancellation of the Closing event.

              void Window_Closing(object sender, CancelEventArgs e)

              {

                   foreach (var pane in dockManager.GetPanes(PaneNavigationOrder.VisibleOrder))

                        pane.ExecuteCommand(ContentPaneCommands.Close);

                  // need ability to detect cancellation  from Closing event below and issue e.Cancel = true here

                }

               void Pane_Closing(object sender, PaneClosingEventArgs e)

              {

                     // for whatever reason ...

                    e.Cancel = true;

              }