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procedure TForm1.FormCreate(Sender: TObject);
begin
   ADOQ1.Active := True;

     FieldList := TStringList.Create;
     TreeView1.Items.BeginUpdate;
     ADOQ1.First;
     while not ADOQ1.Eof do
     begin
          TreeAddItem(TreeView1, GetFieldList, ADOQ1.GetBookmark, False);
          ADOQ1.Next;
     end;

     FieldList.Clear;
     TreeView1.Alphasort;
     TreeView1.Items.EndUpdate;

//make first record selected:
     TreeView1.Items[2].Selected := true;
end;					

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, ADODB, ImgList, ComCtrls, StdCtrls, VirtualTrees, rs,
  cxControls, cxContainer, cxTreeView;

type
  PTreeData = ^TTreeData;
  TTreeData = record
  FObject: TObject;
  end;

type
  TTreeDataClass = class
 private
  FTestStr1: String;
 published
  property TestStr1: String read FTestStr1 write FTestStr1;
  end;

type
  TForm1 = class(TForm)

    ADOCon1: TADOConnection;
    ADOQ1: TADOQuery;
    DS1: TDataSource;
    IL1: TImageList;
    VST: TVirtualStringTree;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    DBGridPro1: TDBGridPro;
    ADOQ1TVID: TAutoIncField;
    ADOQ1TVDummy: TWideStringField;
    ADOQ1TVParent1: TWideStringField;
    ADOQ1TVParent2: TWideStringField;
    ADOQ1TVParent3: TWideStringField;
    ADOQ1TVImage: TWideStringField;
    ADOQ1TVErstelDatum: TDateTimeField;
    ADOQ1TVErstelBenutzer: TWideStringField;
    ADOQ1TVAenderDatum: TDateTimeField;
    ADOQ1TVAenderBenutzer: TWideStringField;
    ImageList1: TImageList;
    TreeView1: TcxTreeView;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    function GetFieldList: TStringList;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure TreeView133Change(Sender: TObject; Node: TTreeNode);
    procedure DS1StateChange(Sender: TObject);
    procedure ADOQ1AfterInsert(DataSet: TDataSet);
    procedure ADOQ1BeforeDelete(DataSet: TDataSet);
    procedure ADOQ1BeforeEdit(DataSet: TDataSet);
    procedure ADOQ1AfterDelete(DataSet: TDataSet);
    procedure ADOQ1AfterPost(DataSet: TDataSet);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure TreeView1Click(Sender: TObject);
    procedure VSTClick(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
  FieldList: TStringList;

implementation
uses TreeFunc;

{$R *.dfm}
//------------------------------------------------------------------------------------
procedure TForm1.FormCreate(Sender: TObject);
begin
   ADOQ1.Active := True;

     FieldList := TStringList.Create;
     TreeView1.Items.BeginUpdate;
     ADOQ1.First;
     while not ADOQ1.Eof do
     begin
          TreeAddItem(TreeView1, GetFieldList, ADOQ1.GetBookmark, False);
          ADOQ1.Next;
     end;

     FieldList.Clear;
     TreeView1.Alphasort;
     TreeView1.Items.EndUpdate;

//make first record selected:
     TreeView1.Items[2].Selected := true;
end;
//------------------------------------------------------------------------------------procedure TForm1.Button1Click(Sender: TObject);
begin
//   VST.AbsoluteIndex := 5;
end;
//------------------------------------------------------------------------------------procedure TForm1.Button2Click(Sender: TObject);
begin
//
end;
//------------------------------------------------------------------------------------
procedure TForm1.Button3Click(Sender: TObject);
var  MyTreeNode1, MyTreeNode2: TTreeNode;
begin
  with TreeView1.Items do
  begin
    Clear; { vorhandene Knoten entfernen }
    MyTreeNode1 := Add(nil, 'Root 1'); { Hauptknoten hinzufügen }
    { Untergeordneter Knoten wurde gerade hinzugefügt }
    AddChild(MyTreeNode1,'ChildNode1');

    {Weiteren Hauptknoten hinzufügen}
    MyTreeNode2 := Add(MyTreeNode1, 'Root 2');
    {MyTreeNode2 an untergeordnetes Objekt übergeben }
    MyTreeNode2.ImageIndex := 0;
    MyTreeNode2.SelectedIndex := 1;

    AddChild(MyTreeNode2,'ChildNode2');

    {Change MyTreeNode2 to ChildNode2 }
    { und untergeordneten Knoten hinzufügen}
    MyTreeNode2 := TreeView1.Items[3] ;
    AddChild(MyTreeNode2,'ChildNode2a');

    MyTreeNode2 := TreeView1.Items[4] ;
    AddChild(MyTreeNode2,'ChildNode3a');

    {Untergeordneten Knoten zu ChildNode2, nach ChildNode2a hinzufügen}
    Add(MyTreeNode2,'ChildNode2b');

    {Weiteren Hauptknoten hinzufügen}
    Add(MyTreeNode1, 'Root 3');
  end;
end;

//--------------------------------------------------------------------------------------------------
function TForm1.GetFieldList: TStringList;
begin
   FieldList.clear;
   FieldList.add(ADOQ1.FieldByName('TVParent1').AsString);
   FieldList.add(ADOQ1.FieldByName('TVParent2').AsString);
   FieldList.add(ADOQ1.FieldByName('TVParent3').AsString);
   Result := FieldList;
end;
//------------------------------------------------------------------------------------
procedure TForm1.TreeView133Change(Sender: TObject; Node: TTreeNode);
begin
   DS1.Enabled := Node.Data <> nil;
   if DS1.Enabled then ADOQ1.GotoBookmark(Node.Data);
end;
//------------------------------------------------------------------------------------procedure TForm1.DS1StateChange(Sender: TObject);
begin
//   ItemList: TStringList;
//   Node: TTreeNode;
end;
//--------------------------------------------------------------------------------
procedure TForm1.ADOQ1AfterInsert(DataSet: TDataSet);
begin
   ADOQ1.ClearFields;
end;
//--------------------------------------------------------------------------------
procedure TForm1.ADOQ1BeforeDelete(DataSet: TDataSet);
begin
   GetFieldList;
end;
//--------------------------------------------------------------------------------
procedure TForm1.ADOQ1BeforeEdit(DataSet: TDataSet);
begin
   GetFieldList;
end;
//--------------------------------------------------------------------------------
procedure TForm1.ADOQ1AfterDelete(DataSet: TDataSet);
var CascadeDeleteLevel: Integer;
begin
   CascadeDeleteLevel := 0;
   TreeDeleteItem(TreeView1, FieldList, CascadeDeleteLevel);
end;
//--------------------------------------------------------------------------------
procedure TForm1.ADOQ1AfterPost(DataSet: TDataSet);
begin
     TreeView1.Items.BeginUpdate;

     if FieldList.Count > 0 then TreeDeleteItem(TreeView1, Fieldlist, 0);
     TreeView1.Selected := TreeAddItem(TreeView1, GetFieldlist, ADOQ1.GetBookmark, True);

     TreeView1.Items.EndUpdate;
end;
//--------------------------------------------------------------------------------
procedure TForm1.Button4Click(Sender: TObject);
begin
   TreeView1.LoadFromFile('TreeView.txt');
end;
//--------------------------------------------------------------------------------
procedure TForm1.Button5Click(Sender: TObject);
begin
   TreeView1.SaveToFile('TreeView.txt');
end;
//--------------------------------------------------------------------------------
procedure TForm1.TreeView1Click(Sender: TObject);
  var  Node: PVirtualNode;
       Data: PTreeData;
begin
   Node := VST.FocusedNode;
   if not Assigned(Node) then Exit;
   Data := VST.GetNodeData(Node);
   Showmessage(TTreeDataClass(Data.FObject).TestStr1);
end;
//--------------------------------------------------------------------------------
procedure TForm1.VSTClick(Sender: TObject);
  var  Node: PVirtualNode;
       Data: PTreeData;
begin
   Node := VST.FocusedNode;
   if not Assigned(Node) then Exit;
   Data := VST.GetNodeData(Node);
   Showmessage(TTreeDataClass(Data.FObject).TestStr1);
end;

end.					

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type
  TRecord = class
  private
     FText: String;
  public
     property Text: String read FText write FText;
  end;

...
// definiere eine eigene methode 
procedure TForm1.LoadData();
var
  LCnt: Integer;
  LNode: PVirtualNode;
  LRecord: TRecord;
  LData: Pointer;+
begin
   Q1.Filter := ''; 
   Q1.Filtered := false; 
   if not Q1.Active then 
       Q1.Open; 
   VST2.NodeDataSize := 4; 

   VST2.BeginUpdate; 
   VST2.Clear; 

   try
     for LCnt := 0 to Q1.RecordCount - 1 do begin   
        LNode := VST2.addChildNode(nil);
        LData := VST2.getNodeData(LNode);
        LRecord := TRecord.create;
        LRecord.Text := IntToStr(LCnt);// hier kannst du nun auch text aus der tabelle reinschreiben
       TObject(LData^) := LRecord;
     end;
   finally
     VST2.EndUpdate;   
   end;
end;

// nun in formcreate 
procedure TForm1.FormCreate(Sender: TObject);
var 
   I: Integer; 
begin 
   with VST2.Header do 
      for I := 0 to Columns.Count - 1 do 
         Columns[I].Hint := Columns[I].Hint + #10 + '(Can Show further information in hints too. )'; 
   ConvvertToHighColor(TreeImages);
  loadData();
end;

..
// jetzt noch gettext
procedure TForm1.Vst2OnGetText(...);
var
  Data: Pointer;
begin
  assert(Node <> nil);
  Data := VST2.getNodeData(Node);
  if Data = nil then exit;
  CellText := TRecord(Data).Text;
end;