How to detect if a Docked/Floating window content is visible or not in Tabbed state?

In our DockingManager, normally the Dock and Float windows are visible. But if the items are Tabbed inside another Dock or Float window, we can get the visible items in Dock and Float window by SelectedContent from InternalTabControl of DockedElementHost. We can get the DockedElementHost of each element using GetHost method. The same has been demonstrated in the following code example:

XAML:

The following code shows of adding the children in the DockingManager.

C#:

Output:

The following output shows the visible elements of the DockingManager in the textbox.