Initial Round of Sandbox implementation

reference.py

@@ -21,6 +21,12 @@ class ReferenceManager:
 
 
 ####   all event selecting some tracking points
+    def swithToUserDefinedLocation(self):
+        n = self.parent.UITrackReference.count()
+        self.parent.UITrackReference.setCurrentIndex(n-1)
+
+    def updateReferenceLocation(self,location):
+        self.parent.UITrackLocation.setText(location)
 
     def updateReferencePoint(self,twiss):
         for key in self.twisswidget.keys():
@@ -47,7 +53,7 @@ class ReferenceManager:
             return
         twiss = self.reference['Reference'][key]['twiss']
         name = self.reference['Reference'][key]['location']
-        self.parent.UITrackLocation.setText(name)
+        self.updateReferenceLocation(name)
         self.updateReferencePoint(twiss)
 
     def updateReferenceComboBox(self):