I created a VF page to mock the notes and attachments related list. Now i have it to where the attachments are inserted on top of the notes. How can I get them  sorted by created date to make them mix in with each other instead of attachments being on top and notes being underneath. Any help is appreciated. Thanks.

global class NotesAttachment{
   
    public List<Note> n1 {get;set;}
    public List<Tuple> combinations{get;set;}
    public string ecid{get;set;}
    public string dcid{get;set;}
    public Datetime CreatedDate;
    String strid = System.currentPagereference().getParameters().get('id');
    public sObject Tuppy;   
    public List<Tuple> pageCombinations {get;set;}
    private Integer pageNumber;
    private Integer PageSize;
    private Integer totalPageNumber;
   
   
   
    public Integer getPageNumber(){
       return pageNumber;
    }
    public Integer getPageSize(){
       return pageSize;
    }
    public Boolean getPreviousButtonEnabled(){
           return !(pageNumber> 1);
   
    }
   
    public Integer getTotalPageNumber(){
       if(totalPageNumber == 0 && combinations != null){

        totalPageNumber = combinations.size() / pageSize;
        Integer mod = combinations.size() - (totalPageNumber * pageSize);
        if(mod > 0)
        totalPageNumber++;
        }
    return totalPageNumber;
    }
   
  
   
    public NotesAttachment(ApexPages.StandardController stdController)
     {
        
       //rlucas Paging
       pageNumber = 0;
       totalPageNumber = 0;
       pageSize = 7;
       ViewData();  

    }
   
    //rlucas view note/attachment
    public PageReference ViewData()
    {
        combinations = null;
        totalPageNumber = 0;
        BindData(1);
        return null;
    }
    private void BindData(Integer newPageIndex){
    try{
        //if(combinations == null)
        combinations = new List<Tuple>();
  
        Tuple tr;
        List<Attachment> atts =[SELECT Id, Name, createdbyid, createdDate, lastmodifieddate, ContentType, BodyLength, parentID FROM Attachment where parentid=:ApexPages.currentPage().getParameters().get('Id') order by createddate desc];
        List<Note> nt = [select Body, CreatedById, createdDate,Id, Title, parentID, LastModifieddate from Note where parentid=:ApexPages.currentPage().getParameters().get('Id') order by createdDate desc];
        for(Attachment att : atts){
                //Instantiating the wrapper sObject
                tr = new Tuple();
               
                //Assigning the wrapper variables
                tr.title = att.Name;
                tr.parentID = att.parentID;
                tr.CreatedById = att.CreatedById;
                tr.body = att.ContentType;
                tr.id = att.id;
                tr.LastModifieddate = att.LastModifieddate;
           
                //*Add everything to the List then and there*/
                combinations.add(tr);
            
        } 
         
      
        for(Note con : nt){
            tr = new Tuple();
            tr.title = con.title;
            tr.parentID = con.parentID;
            tr.CreatedById = con.CreatedById;
            tr.body = con.Body;
            tr.id = con.id;
            tr.LastModifieddate = con.LastModifieddate;
           
            /*Add the TableRow to the List then and there*/
            combinations.add(tr);
       }
  
       pageCombinations = new List<Tuple>();
       Transient Integer counter = 0;
       Transient Integer min = 0;
       Transient Integer max = 0;
       if(newPageIndex > pageNumber){
            min = pageNumber * pageSize;
            max = newPageIndex * pageSize;
        } else {
           max = newPageIndex * pageSize;
           min = max - pageSize;
        }
        for(Tuple t : combinations){
           counter ++;
           if(counter > min && counter <=max)
           pageCombinations.add(t);
        }
        pageNumber = newPageIndex;
        if(pageCombinations == null || pageCombinations.size() <= 0)
        ApexPages.addmessage(new ApexPages.message(ApexPages.severity.INFO,'Data not available for this view.'));
    }
    catch(Exception ex)
    {
        ApexPages.addmessage(new ApexPages.message(ApexPages.severity.FATAL,ex.getMessage()));
    }
    }
   
    public Boolean getNextButtonDisabled(){
       if(combinations == null) return true;
       else
       return((pageNumber * pageSize) >= combinations.size());

    }
    public PageReference nextBtnClick(){
        BindData(pageNumber + 1);
    return null;
    }
    public PageReference previousBtnClick(){
        BindData(pageNumber - 1);
    return null;

    }
   
   
   
    //wrapper class
    global class Tuple
   {
     
      public String id {get; set;}
      public String body  {get; set;}
      public String Title {get; set;}
      public String parentID {get; set;}
      public DateTime LastModifieddate{get; set;}
      public String createdbyid  {get; set;}
      public DateTime CreatedDate {get; set;}
      public String Name {get; set;}
      public String ContentType {get; set;}

    }
   
    public NotesAttachment(){
        combinations = new List<Tuple>();
      
       
    }