What is preferred way to remove a DockItem from ObservableCollection binded to DockingManager?

Question

Hi,I saw the documentation to bind the collection dock items to the docking manager here.

Data Binding in WPF Docking control | Syncfusion

But when I close the window, I want the instance to also be removed, because the items in this collection can be instantiated many times. However, when I look at the collection it is still there.What is the preferred way to remove from the ObservableCollection when the window is closed so that the dock item can be cleaned up?Is it to handle WindowClosing event?If so, how to access the DockItem in this case?

Gokul Thanudhas · Accepted Answer

Hi Lorenzo,The ActiveWindow property will store the window that you are
currently working on. Comparing the name of the ActiveWindow with the name of the
items in Itemsource of DockingManager you can able to get the DockItem. Please
refer the attached sample for your referenceRegards,Gokul T.Attachment: DockingManager_ActiveWindow_3140a46d.zip

Gokul Thanudhas · Answer

Hi Lorenzo,The state of the window will be moved to hidden state while
closing the window. To remove the DockItem from ObservableCollection remove the
item from the Children of DockingManager in StateChanged event.Code Snippetsprivate void
docking_DockStateChanged(FrameworkElement sender, DockStateEventArgs e)        {            if (e.NewState == DockState.Hidden)               
docking.Children.Remove(sender);        }Regards,Gokul T.

Lorenzo · Answer

Thanks Gokul,What is the best way to get a reference to the DockItem and/or the parent dockingManager?I need to know the window I'm working with to determine if it should be removed or just stay hidden.