QT WINCE7 opacity window

S_Gura

Hi!
I am using the TORADEX Colibri T30 module with WINCE7.
I am trying to create a opacity window in QT by setting the window property setWindowOpacity (0.3).
But the window remains opaque.
Then I added the SYSGEN_COMPOSITION and BSP_GLES2COMPOSITOR components to the WINCE7 assembly and created a new OS image using the Platform Builder as described here http://download.microsoft.com/download/2/4/A/24A36661-A629-4CE6-A615-6B2910A1367A/Window Compositor Developer's Guide.pdf.
However, when I upload the image to the Colibri T30, I only see a black screen on which the mouse pointer can move.
How can I still solve my problem?
To check the transparency of the window, I use the code provided in the attachment.

#include "draggablewidget.h"
#include "ui_draggablewidget.h"

#include <QDebug>
#include <QMouseEvent>

#include <QBitmap>

DraggableWidget::DraggableWidget( QWidget* parent ) :
    QWidget( parent, Qt::Window | Qt::FramelessWindowHint ),
    ui( new Ui::DraggableWidget ), dx( 0 ), dy( 0 ) {
    ui->setupUi( this );

    ui->lbTitle->setText( windowTitle() );

    connect( ui->btnQuit, SIGNAL( clicked( bool ) ), qApp, SLOT( quit() ) );

    setWindowOpacity( 0.2 );
}

DraggableWidget::~DraggableWidget() {
    delete ui;
}

void DraggableWidget::mouseMoveEvent( QMouseEvent* e ) 
{
    if( e->buttons() | Qt::LeftButton ) 
	{
        setGeometry(
            pos().x() + ( e->x() - dx ),
            pos().y() + ( e->y() - dy ),
            width(),
            height()
        );
    }
}

Maybe I have the wrong code?

Regards
Sergey Gura