--- a/radioapp/radiowidgets/inc/radiostripbase.h	Mon May 03 12:31:41 2010 +0300
+++ b/radioapp/radiowidgets/inc/radiostripbase.h	Fri May 14 15:52:32 2010 +0300
@@ -49,7 +49,7 @@
 
 protected:
 
-    RadioStripBase( QGraphicsItem* parent );
+    RadioStripBase( QGraphicsItem* parent = 0 );
 
 // from base class QGraphicsWidget
 
@@ -71,7 +71,7 @@
     virtual void updateItemPrimitive( QGraphicsItem* itemToUpdate, int itemIndex ) = 0;
     virtual QGraphicsItem* createItemPrimitive( QGraphicsItem *parent ) = 0;
 
-    virtual void scrollPosChanged( QPointF newPosition );
+    virtual void scrollPosChanged( QPointF newPosition ) = 0;
 
     void moveAllItemsToPool();