TRoot = Record
  RootName : String;
  RootId : Integer;
  Kids : TList; //(of TKid)
End;

TKid = Record
  KidName : String;
  KidId : Integer;
End;

TNodeClass = class
public
  Name: string;
  ID: Integer;
end;

type
  TNode = class
  public
    ID: integer;
    Name: string;
    VTNode: PVirtualNode;
    Sub: TObjectList<TNode>;

    constructor Create(aName: string = ''; anID: integer = 0);
    destructor Destroy; override;
  end;

constructor TNode.Create(aName:string; anID: Integer);
begin
  Name := aName;
  ID := anID;

  Sub := TObjectList<TNode>.Create;
end;

destructor TNode.Destroy;
begin
  Sub.Free;
end;

Root := TNode.Create;

// Create the Contacts leaf
Root.Sub.Add(TNode.Create('Contacts', -1));
// Add some contacts
Root.Sub[0].Sub.Add(TNode.Create('Abraham', 1));
Root.Sub[0].Sub.Add(TNode.Create('Lincoln', 2));

// Create the "Recent Calls" leaf
Root.Sub.Add(TNode.Create('Recent Calls', -1));
// Add some recent calls
Root.Sub[1].Sub.Add(TNode.Create('+00 (000) 00.00.00', 3));
Root.Sub[1].Sub.Add(TNode.Create('+00 (001) 12.34.56', 4));

procedure TForm1.AddNodestoTree(ParentNode: PVirtualNode; Node: TNode);
var SubNode: TNode;
    ThisNode: PVirtualNode;

begin
  ThisNode := VT.AddChild(ParentNode, Node); // This call adds a new TVirtualNode to the VT, and saves "Node" as the payload

  Node.VTNode := ThisNode; // Save the PVirtualNode for future reference. This is only an example,
                           // the same TNode might be registered multiple times in the same VT,
                           // so it would be associated with multiple PVirtualNode's.

  for SubNode in Node.Sub do
    AddNodestoTree(ThisNode, SubNode);
end;

// And start processing like this:
VT.NodeDataSize := SizeOf(Pointer); // Make sure we specify the size of the node's payload.
                                    // A variable holding an object reference in Delphi is actually
                                    // a pointer, so the node needs enough space to hold 1 pointer.
AddNodesToTree(nil, Root);

procedure TForm1.VTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
  Column: TColumnIndex; TextType: TVSTTextType; var CellText: string);
var PayloadObject:TObject;
    Node: TNode;
    Contact : TContact;
    ContactCategory : TContactCategory;
begin
  PayloadObject := TObject(VT.GetNodeData(Node)^); // Extract the payload of the node as a TObject so
                                                   // we can check it's type before proceeding.
  if not Assigned(PayloadObject) then
    CellText := 'Bug: Node payload not assigned'
  else if PayloadObject is TNode then
    begin
      Node := TNode(PayloadObject); // We know it's a TNode, assign it to the proper var so we can easily work with it
      CellText := Node.Name;
    end
  else if PayloadObject is TContact then
    begin
      Contact := TContact(PayloadObject);
      CellText := Contact.FirstName + ' ' + Contact.LastName + ' (' + Contact.PhoneNumber + ')';
    end
  else if PayloadObject is TContactCategory then
    begin
      ContactCategory := TContactCategory(PayloadObject);
      CellText := ContactCategory.CategoryName + ' (' + IntToStr(ContactCategory.Contacts.Count) + ' contacts)';
    end
  else
    CellText := 'Bug: don''t know how to extract CellText from ' + PayloadObject.ClassName;
end;

procedure TForm1.ButtonModifyClick(Sender: TObject);
begin
  Root.Sub[0].Sub[0].Name := 'Someone else'; // I'll modify the node itself
  VT.InvalidateNode(Root.Sub[0].Sub[0].VTNode); // and invalidate the tree; when displayed again, it will
                                                // show the updated text.
end;

uses
  svCollections.GenericTrees;

type
  TMainData = record
    Name: string;
    ID: Integer;
  end;

MyTree: TSVTree<TMainData>;

MyTree: TSVTree<TMainData>.Create(False);

MyTree.VirtualTree := VST;

procedure TForm1.BuildStructure(Count: Integer);
var
  i, j: Integer;
  svNode, svNode2: TSVTreeNode<TMainData>;
  Data: TMainData;
begin
  MyTree.BeginUpdate;
  try
    for i := 0 to Count - 1 do
    begin
      Data.Name := Format('Root %D', [i]);
      Data.ID := i;
      svNode := MyTree.AddChild(nil, Data);
      for j:= 0 to 10 - 1 do
      begin
        Data.Name := Format('Child %D', [j]);
        Data.ID := j;
        svNode2 := MyTree.AddChild(svNode, Data);
      end;
    end;
  finally
    MyTree.EndUpdate;
  end;
end;

procedure TForm1.vt1InitChildren(Sender: TBaseVirtualTree; Node: PVirtualNode;
  var ChildCount: Cardinal);
var
  svNode: TSVTreeNode<TMainData>;
begin
  svNode := MyTree.GetNode(Sender.GenerateIndex(Node));
  if Assigned(svNode) then
  begin
    ChildCount := svNode.FChildCount;
  end;
end;

procedure TForm1.vt1InitNode(Sender: TBaseVirtualTree; ParentNode,
  Node: PVirtualNode; var InitialStates: TVirtualNodeInitStates);
var
  svNode: TSVTreeNode<TMainData>;
begin
  svNode := MyTree.GetNode(Sender.GenerateIndex(Node));
  if Assigned(svNode) then
  begin
    //if TSVTree<TTestas> is synced with Virtual Treeview and we are building tree by
    // setting RootNodeCount, then we must set svNode.FVirtualNode := Node to
    // have correct node references
    svNode.FVirtualNode := Node;  // Don't Forget!!!!
    if svNode.HasChildren then
    begin
      Include(InitialStates, ivsHasChildren);
    end;
  end;
end;

//display info how you like, I simply get name and ID values
procedure TForm1.vt1GetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
  Column: TColumnIndex; TextType: TVSTTextType; var CellText: string);
var
  svNode: TSVTreeNode<TMainData>;
begin
  svNode := MyTree.GetNode(Sender.GenerateIndex(Node));
  if Assigned(svNode) then
  begin
    CellText := Format('%S ID:%D',[svNode.FValue.Name, svNode.FValue.ID]);
  end;
end;

type
  TNode = class
    Parent: TNode;
    NextSibling: TNode;
    FirstChild: TNode;
  end;

  TTree = class
    Root: TNode;
    function AddNode(Parent: TNode): TNode;
  end;

function TTree.AddNode(Parent: TNode);
var
  Node: TNode;
begin
  Result := TNode.Create;

  Result.Parent := Parent;
  Result.NextSibling := nil;
  Result.FirstChild := nil;

  //this may be the first node in the tree
  if not Assigned(Root) then begin
    Assert(not Assigned(Parent));
    Root := Result;
    exit;
  end;

  //this may be the first child of this parent
  if Assigned(Parent) and not Assigned(Parent.FirstChild) then begin
    Parent.FirstChild := Result;
  end;

  //find the previous sibling and assign its next sibling to the new node
  if Assigned(Parent) then begin
    Node := Parent.FirstChild;
  end else begin
    Node := Root;
  end;
  if Assigned(Node) then begin
    while Assigned(Node.NextSibling) do begin
      Node := Node.NextSibling;
    end;
    Node.NextSibling := Result;
  end;
end;