/// <summary>
 /// Get element from Context element. Possible inputs are: Attribute, Operation, Element, Package
 /// </summary>
 /// <param name="rep"></param>
 /// <returns></returns>
 public static EA.Element GetElementFromContextObject(EA.Repository rep)  {
     EA.Element el = null;
     EA.ObjectType objectType = rep.GetContextItemType();
     switch (objectType)
     {
         case ObjectType.otAttribute:
             var a = (EA.Attribute)rep.GetContextObject();
             el = rep.GetElementByID(a.ParentID);
             break;
         case ObjectType.otMethod:
             var m = (Method)rep.GetContextObject();
             el = rep.GetElementByID(m.ParentID);
             break;
         case ObjectType.otElement:
             el = (EA.Element)rep.GetContextObject();
             break;
         case ObjectType.otPackage:
             EA.Package pkg  = rep.GetContextObject();
             el = rep.GetElementByGuid(pkg.PackageGUID);
             break;
         case ObjectType.otNone:
             EA.Diagram dia = rep.GetCurrentDiagram();
             if (dia?.SelectedObjects.Count == 1)
             {
                 var objSelected = (EA.DiagramObject)dia.SelectedObjects.GetAt(0);
                 el = rep.GetElementByID(objSelected.ElementID);
             }
             break;
         default:
             MessageBox.Show(@"No Element, Attribute, Operation, Package selected");
             break;
      }
     return el;
 }