DropDownContextMenu doesn't show when adding a new document

[mgaga606]

I am adding a new Document to DocumentsSource but despite it's adding the Document, it doesn't show the DropDownContextMenu when I click the tab... I don't know if there is something I'm not doing...

When or how is setted the value of the DependencyProperty DropDownContextMenuProperty??? If I debug, its always null...

I am adding the manager to my mainview via c# code... not in the xaml, is there anything missing??:

DockingManager manager = new DockingManager();
manager.DocumentsSource = Maps;
manager.LayoutItemContainerStyle = LayoutItemContainerStyle;
var layoutItemTemplateSelector = new PanesTemplateSelector();
layoutItemTemplateSelector.MapViewTemplate = CreateMapViewTemplate();
manager.LayoutItemTemplateSelector = layoutItemTemplateSelector;

LayoutRoot root = new LayoutRoot();
var hPanel = new LayoutPanel();
hPanel.Orientation = Orientation.Horizontal;
root.RootPanel = hPanel;
manager.Layout = root;

var mainPane = new LayoutDocumentPane();
var mainPaneGroup = new LayoutDocumentPaneGroup();
mainPaneGroup.Children.Add(mainPane);
hPanel.Children.Add(mainPaneGroup);

[mgaga606]

I saw the problem...