AvalonDock: CanClose-property always false for Documents in 3.3

[xceedsoftware]

Dige[CodePlex]
Using MVVM bindings for anchorables and documents in v. 3.3 causes an issue that when moving an anchorable into the document pane the CanClose-property of the LayoutItem is always false and that panel cannot be closed. The issue can be easily reproduced
with the attached sample, just move the panel to the middle of the docking manager and see that the Close-button does not appear.

This worked fine in 3.2.

[xceedsoftware]

BoucherS[CodePlex]
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[xceedsoftware]

BoucherS[CodePlex]
Hi,

Starting at v3.3, a LayoutAnchorable has its CanClose property set to false by default. So docking it in a LayoutDocumentPane will not show the X because it can't be closed.

This will be fixed in v3.4.