def initialize(docManager):
global __Observer
#we only initialize ones
if __Observer:
return
#add the freecad observer
__observer = __DocumentObserver(docManager)
__guiObserver = __GUIDocumentObserver(docManager)
FreeCAD.addDocumentObserver(__observer)
FreeCADGui.addDocumentObserver(__guiObserver)
__Observer = __ObserverManager(__guiObserver, __observer)
