Yes, this does not work for me either. The only thing that does work is this:

Set CanHide=False in MlibTest.MainWindow.xaml (at about Line 147)
<Setter Property="CanHide" Value="False" />

Ensure that the MLibTest.Demos.LayoutInitializer class contains this line anchorableToShow.CanDockAsTabbedDocument = false;

in the method BeforeInsertAnchorable definition

        public bool BeforeInsertAnchorable(LayoutRoot layout,
                                           LayoutAnchorable anchorableToShow,
                                           ILayoutContainer destinationContainer)
        {
            // AD wants to add the anchorable into destinationContainer
            // just for test provide a new anchorablepane 
            // if the pane is floating let the manager go ahead
            LayoutAnchorablePane destPane = destinationContainer as LayoutAnchorablePane;
            if (destinationContainer != null &&
                destinationContainer.FindParent<LayoutFloatingWindow>() != null)
                return false;

            var toolsPane = layout.Descendents().OfType<LayoutAnchorablePane>().FirstOrDefault(d => d.Name == "ToolsPane");
            if (toolsPane != null)
            {
                // do not allow this as Tabbed Document
                anchorableToShow.CanDockAsTabbedDocument = false;
                toolsPane.Children.Add(anchorableToShow);
                return true;
            }

            return false;

        }

Now, the close button is not shown and only AutoHide is available. There is also a realated issue here:
xceedsoftware/wpftoolkit#1500 (comment)

I'll ask Boris if he can suggest a default value or change in the serialization behavior to get this fixed...

LayoutAnchorable closeable but "CanClose" is False #68

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