Transparent widgets

[incapacitant]

// destinataires push button
  pbDestin = new QPushButton( "Destinataires", this); 
  pbDestin->resize( QSize( 80, 20 ) ); 
  pbDestin->move( 15, 90 );
  QPalette p( pbDestin->palette() );
  p.setBrush( QPalette::Button, Qt::NoBrush );
  pbDestin->setPalette( p );

// destinataires push button
  pbDestin = new QPushButton( "Destinataires", this); 
  pbDestin->resize( QSize( 80, 20 ) ); 
  pbDestin->move( 15, 90 );
  QPalette p( pbDestin->palette() );
  p.setBrush( QPalette::Button, Qt::NoBrush );
  pbDestin->setPalette( p );

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This won't work. What am I doing wrong ?