In short, I'm trying to add Object into VirtualTreeView but am always getting error `EAccessViolation` at CellText I'm wondering about the reason for the error i tried to do my best but without result...

this is my attempt:

```
 TForm1 = class(TForm)
 private

 public

 end;

 TPerson = class;

 PPersonNode = ^TPersonNode;
 TPersonNode = record
   PersonObj: TPerson;
 end;

 TPerson = class(TObject)
 private
   FName: string;
 public
   property Name: string read FName write FName;
 end;

 procedure TForm1.Button1Click(Sender: TObject);  
 var
   PersonRec: PPersonNode;
 begin
   PersonRec := VirtualStringTree1.GetNodeData(VirtualStringTree1.AddChild(nil));
   PersonRec.PersonObj := TPerson.Create;
   PersonRec.PersonObj.Name := 'aaa'; 
 end;

 procedure TForm1.VirtualStringTree1GetNodeDataSize(Sender: TBaseVirtualTree;
   var NodeDataSize: Integer);
 begin
   NodeDataSize := SizeOf(TPersonNode);
end;

procedure TForm1.VirtualStringTree1GetText(Sender: TBaseVirtualTree;
  Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType;
var CellText: string);
var
   PersonRec: PPersonNode;
begin
   PersonRec := Sender.GetNodeData(Node);
   CellText := PersonRec.PersonObj.Name;
end;

```