I try this but It seems don't work.

Qt Code: 
  1. void AzimutScale::paintEvent( QPaintEvent * ){   
  2. QPainter paint;      
  3. drawScale( &paint ); 
  4. QBitmap bm( size() );   
  5.  bm.fill( color0 );
  6. setMask( bm );    
  7. }
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