How to know which window become floating in FloatingWindowOpening event

Hello,

Would you please let me know how to know which window become floating in FloatingWindowOpening event?

I'm trying as the following now.

private void DockSite_FloatingWindowOpening(object? sender, FloatingWindowOpeningEventArgs e)
        {
            IEnumerable<DockingWindow>? floatingWindows;
            if (e.DockHostChild is Workspace workspace
                && workspace.Content is TabbedMdiHost tabbedMdiHost
                && tabbedMdiHost.Child is TabbedMdiContainer tabbedMdiContainer)
            {
                // DocumentWindow
                floatingWindows = tabbedMdiContainer.Windows.Where(x => x.IsFloating);
            }
            else if (e.DockHostChild is ToolWindowContainer toolWindowContainer)
            {
                // ToolWindow
                floatingWindows = toolWindowContainer.Windows.Where(x => x.IsFloating);
            }
            else
            {
            }
        }