Hi Andres,
Thanks for contacting Syncfusion support.
We have checked your query and prepared a sample to meet your requirement. The state of the docking child will be changed as Hidden while closing the window (child of DockingManager). We can store the reference of the Closed window in our ViewModel and restore them whenever needed. In this sample, we have stored the closed windows reference in MenuItemViewModel, and provided a menu options to open the recently used tab and we displayed the recently closed tabs under "Recent Files.." menuitem. Also the closed windows can be restored using RestoreElement() method of DockingManager based on the state of the Child element while clicking the item from menu. And, we have prepared a sample for the same, please download the sample from below location.
If we misunderstood your query please provide more details and sample about your requirement.
Regards,
Durga S.