function AddVSTStructure(AVST: TCustomVirtualStringTree; ANode: PVirtualNode; AObject: TDATArecord): PVirtualNode;
var
  Data: PUserData;
begin
  Result := AVST.AddChild(ANode);
  Data := AVST.GetNodeData(Result);
  AVST.ValidateNode(Result, false);
  Data^.FObject := AObject;
end;

//adding node
VDT1.BeginUpdate;
try
  DATArecord.name := 'nodename';
  DATArecord.Visible:= False;
  AddVSTStructure(VDT1, nil, DATArecord);
finally
  VDT1.EndUpdate;
end;

Result := AVST.AddChild(ANode);
AVST.IsVisible[Result] := AObject.Visible; // <-- add this