keys Return keys of containers.Map object
    K = keys(mapObj) returns a cell array containing all of the keys stored
    in mapObj.
 
    Examples:
 
      myKeys = {'a','b','c'};
      myValues = [1,2,3];
      mapObj = containers.Map(myKeys,myValues);
  
      keySet = keys(mapObj)
  
    
Help for CParameterList/keys is inherited from superclass containers.Map