FEM: result mechanical VP, add Object

src/Mod/Fem/femguiobjects/_ViewProviderFemResultMechanical.py

@@ -33,6 +33,7 @@ __url__ = "http://www.freecadweb.org"
 import matplotlib.pyplot as plt
 import numpy as np
 
+from pivy import coin
 from PySide import QtCore
 from PySide import QtGui
 from PySide.QtCore import Qt
@@ -50,6 +51,12 @@ class _ViewProviderFemResultMechanical(ViewProviderFemConstraint.ViewProxy):
     A View Provider for the FemResultObject Python derived FemResult class
     """
 
+    def attach(self, vobj):
+        default = coin.SoGroup()
+        vobj.addDisplayMode(default, "Default")
+        self.Object = vobj.Object
+        self.ViewObject = vobj
+
     def setEdit(self, vobj, mode=0):
         ViewProviderFemConstraint.ViewProxy.setEdit(
             self,