__doc__ = 'Set all RvtLink ReferenceTypes to Overlay'
# these commands get executed in the current scope
# of each new shell (but not for canned commands)
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Architecture import *
from Autodesk.Revit.DB.Analysis import *
from Autodesk.Revit.UI import *
from Autodesk.Revit.DB import Transaction

import clr
# clr.AddReferenceByName("PresentationFramework, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")
# clr.AddReferenceByName("PresentationCore, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")
clr.AddReferenceByPartialName('PresentationCore')
clr.AddReferenceByPartialName("PresentationFramework")
clr.AddReferenceByPartialName('System.Windows.Forms')
import System.Windows

uidoc = __revit__.ActiveUIDocument
doc = __revit__.ActiveUIDocument.Document
selection = [ doc.GetElement( elId ) for elId in __revit__.ActiveUIDocument.Selection.GetElementIds() ]

def alert(msg):
	TaskDialog.Show('pyRevit', msg)

def quit():
	__window__.Close()

if len(selection) > 0:
	el = selection[0]



#Creating collector and Getting all RvtLinks
link_collector = FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_RvtLinks)\
											  .WhereElementIsElementType() \
											  .ToElements()

#Storing Reference Type in Variable
reference_types = 0.0
#Starting the Set Transaction
t = Transaction(doc, "Change Reference Types")
t.Start()
for link in link_collector:
	reference_types = link.LookupParameter('Reference Type')
	if reference_types:
		reference_types.Set(2)
#Commiting the Set Transaction
t.Commit()