[mono-vb] Designer does not show up in VB with GTK

[Dr.Diesel]

When I start a new project with GTK the Designer tab does not show up in VB? 
If I start a new project in C it does without issue.

If I go to Options > GTK# Setting and choose Enable GTK for mywindow it
blows this error:

System.NullReferenceException: Object reference not set to an instance of an
object
  at MonoDevelop.GtkCore.GtkCoreService.GetBaseType (IClass widgetClass,
MonoDevelop.Projects.Project project) [0x00000] 
  at MonoDevelop.GtkCore.GtkCoreService.UpdateClass
(MonoDevelop.Projects.Project project, System.Xml.XmlDocument doc, IClass
widgetClass, IClass wrapperClass) [0x00000] 
  at MonoDevelop.GtkCore.GtkCoreService.UpdateObjectsFile
(MonoDevelop.Projects.Project project) [0x00000] 
  at
MonoDevelop.GtkCore.Dialogs.WidgetBuilderOptionPanel+WidgetBuilderOptionPanelWidget.Store
() [0x00000] 
  at MonoDevelop.GtkCore.Dialogs.WidgetBuilderOptionPanel.ApplyChanges ()
[0x00000] 
  at MonoDevelop.Core.Gui.Dialogs.OptionsDialog.ApplyChanges () [0x00000] 
  at
MonoDevelop.Projects.Gui.Dialogs.MultiConfigItemOptionsDialog.ApplyChanges
() [0x00000] 
  at MonoDevelop.Core.Gui.Dialogs.OptionsDialog.OnResponse (ResponseType
resp) [0x00000] 
  at Gtk.Dialog.response_cb (IntPtr dialog, Int32 response_id) [0x00000] 

And ideas?

Thanks

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