Component from TAdvPanel

VCL TMS VCL UI Pack
1
I have components based on TAdvPanel. As of version 2.5.10.5, there is a problem.
   TjstDatePicker = class (TAdvPanel)
if I change it to
   TjstDatePicker = class (TPanel)
so there is no problem. I enclose a list of errors.

Control 'TjstDatePicker($0304DFC0)' has no parent window. Path:
AppBuilder
  ^PanelFrame
  ^DockBottomPanel
  ^EditWindow_0
  ^PanelContainsMiddleStuff
  ^Panel1
  ^ModuleEditorsContainer
  ^pnlBottomCode
  ^CodePanel
  ^EditorPanel
  ^EditorFormDesigner
  ^TFormContainerForm($28F8A470)
  ^Form1
  .TjstDatePicker($0304DFC0).

[50CF1803]{vcl270.bpl  } Vcl.Controls.InvalidControlOperation (Line 3360, "Vcl.Controls.pas" + 1) + $63
[50CFA6FD]{vcl270.bpl  } Vcl.Controls.TWinControl.CreateWnd (Line 9727, "Vcl.Controls.pas" + 13) + $7
[2527A46E]{TMSVCLUIPackPkgDXE13.bpl} Advpanel.TCustomAdvPanel.CreateWnd + $6
[50CFAC7A]{vcl270.bpl  } Vcl.Controls.TWinControl.CreateHandle (Line 9908, "Vcl.Controls.pas" + 3) + $4
2
I forgot about the problematic place

procedure TjstDatePicker.CreatePanelBasic;
begin
  FPanelBasic := TPanel.Create(Self);
  FPanelBasic.Parent := Self;
3

(again) insufficient information / details.


Cannot be reproduced.

Test code

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, AdvPanel;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  TMyPanel = class(TAdvPanel)

  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  mp: TMyPanel;
begin
  mp := TMyPanel.Create(Self);
  mp.Parent := Self;
end;

works without issues.


4

I sent everything I have.

5

Your demo is not a component, but a class!

6

A component IS a class!

7
I'm just giving up. With TPanel OK, with TAdvPanel NO!
Will it not be something like "
HTML POPUP "Invalid window handle"
8

I sent you via direct email a screenshot showing this working. 
After cleanup up your erratic code, this works here as expected.
We created a project with the HTMLPopup as well and no problem can be seen in this project.