fix background color

app/PlaYUVerSubWindowHandle.cpp

@@ -37,6 +37,7 @@ public:
           QMdiArea( parent ),
           m_pixmapLogo( ":/images/playuver-backgroud-logo.png" )
   {
+    setBackgroundRole( QPalette::Background );
   }
 protected:
   void paintEvent( QPaintEvent *event )

app/SubWindowHandle.cpp

@@ -34,7 +34,12 @@ SubWindowHandle::SubWindowHandle( QWidget * parent, UInt category ) :
   setParent( parent );
   setFocusPolicy( Qt::WheelFocus );
   setAttribute( Qt::WA_DeleteOnClose );
-  setBackgroundRole( QPalette::Light );
+  setBackgroundRole( QPalette::Background );
+  QPalette Pal(palette());
+  // set black background
+  //Pal.setColor(QPalette::Background, Qt::white);
+  //setPalette(Pal);
+  setAutoFillBackground( true );
   setWindowIcon( QIcon( ":/images/playuver.png" ) );
 
   // Create a new scroll area inside the sub-window

app/plaYUVerApp.cpp

@@ -70,6 +70,7 @@ plaYUVerApp::plaYUVerApp()
   setUnifiedTitleAndToolBarOnMac( true );
   setCentralWidget( m_pcWindowHandle );
   setAcceptDrops( true );
+  setBackgroundRole( QPalette::Background );
 
   connect( m_pcWindowHandle, SIGNAL( windowActivated() ), this, SLOT( update() ) );
   connect( m_pcWindowHandle, SIGNAL( changed() ), this, SLOT( update() ) );