Ribbon Form - Form borders produce painting artifacts in Windows 7/8 if the form's DisableAero property is set to True and the application is run in compatibility mode for Windows XP or earlier

Hi DevExpress Team,

I have a strange behaviour when creating a simple Delphi 7 Form.

Delphi
unit Unit1;  

interface  

uses  
  Variants, Classes, Graphics, Controls, Forms,  
  Dialogs, dxBar, cxClasses, dxRibbon, cxControls, dxRibbonForm;  

type  
  TForm1 = class(TdxRibbonForm)  
    dxBarManager1: TdxBarManager;  
    dxRibbon1Tab1: TdxRibbonTab;  
    dxRibbon1: TdxRibbon;  
    dxBarManager1Bar1: TdxBar;  
    dxBarLargeButton1: TdxBarLargeButton;  
    procedure dxBarLargeButton1Click(Sender: TObject);  
  private  
    { Private-Deklarationen }  
  public  
    { Public-Deklarationen }  
  end;  

var  
  Form1: TForm1;  

implementation  

{$R *.dfm}  

procedure TForm1.dxBarLargeButton1Click(Sender: TObject);  
begin  
  self.close ;  
end;  

end.  

When I compile & start the application with "SupportNonClientDrawing = False" all seems to be ok. The form is shown correctly.
When I compile & start the application with "SupportNonClientDrawing = True" then parts of the form are missing. You can see that in the attached picture.

This happens only with Delphi 7.  When I do exactly the same with Delphi XE everything is ok.

I cannot move the current Delphi 7 project to XE, so I need a solution for Delphi 7.
What can I do / what have I to adjust / what have I to implement to have a application without artefacts.

Thx in advance.
Greetings from Germany - Robert