Index: simulator/plugins/treatmentranges/loader.py
===================================================================
diff -u -rf921975179b1c1ad61d841b9db5976c00432fdcc -r1779b6711f3791e8bf570e06ddb4c2e7d2a52e18
--- simulator/plugins/treatmentranges/loader.py	(.../loader.py)	(revision f921975179b1c1ad61d841b9db5976c00432fdcc)
+++ simulator/plugins/treatmentranges/loader.py	(.../loader.py)	(revision 1779b6711f3791e8bf570e06ddb4c2e7d2a52e18)
@@ -7,8 +7,8 @@
 from PySide2.QtCore import QTimer
 from PySide2.QtCore import Slot
 from dialin.squish import denaliMessages
+from dialin.ui.hd_simulator import HDSimulator
 
-
 class Loader(DynamicLoader):
     """
     The Treatment Ranges ui loader
@@ -24,9 +24,11 @@
     spnUFVolumeMax: QtWidgets.QSpinBox
     sldDurationValue: QtWidgets.QSlider
 
-    def __init__(self):
-        super().__init__(os.path.dirname(__file__))
+    def __init__(self, hd_simulator: HDSimulator):
+        super().__init__(os.path.dirname(__file__), hd_simulator)
+        print(" ---------- ", self.hd_simulator)
 
+
     def _init_loader(self):
         """
         finds and creates widgets