Overloads the paint event to handle drawing the splitter lines.
        
        :param      event | <QPaintEvent>

def paintEvent( self, event ):
        """
        Overloads the paint event to handle drawing the splitter lines.
        
        :param      event | <QPaintEvent>
        """
        lines = []
        count = 20
        
        # calculate the lines
        if ( self.orientation() == Qt.Vertical ):
            x = self._resizeGrip.pos().x()
            h = self.height()
            spacing = int(float(self._resizeGrip.width()) / count)
            
            for i in range(count):
                lines.append(QLine(x, 0, x, h))
                x += spacing
        else:
            y = self._resizeGrip.pos().y()
            w = self.width()
            spacing = int(float(self._resizeGrip.height()) / count)
            
            for i in range(count):
                lines.append(QLine(0, y, w, y))
                y += spacing
            
        # draw the lines
        with XPainter(self) as painter:
            pal = self.palette()
            painter.setPen(pal.color(pal.Window).darker(120))
            painter.drawLines(lines)