Y axis positioning

I have added extra y axis in the graph. When i am trying to display the graph the added Y axis is not visible. I am able to draw graph with that y axis. How can i make that Y axis visible?

My code is as below..

CPTXYAxis *rightY = [[CPTXYAxis alloc] init]; 

    rightY.coordinate = CPTCoordinateY; 

    rightY.orthogonalCoordinateDecimal = CPTDecimalFromFloat(3600 * 7);

    //rightY.majorGridLineStyle = lineStyle;

    rightY.axisLineStyle = lineStyle2;

    [rightY setAxisTitle:[[CPTAxisTitle alloc] initWithText:@"New Axis" textStyle:whiteText]];

    rightY.gridLinesRange = [[CPTPlotRange alloc] initWithLocation:CPTDecimalFromInt(0) length:CPTDecimalFromInt(15)];

    rightY.plotSpace = plotSpace1;

    NSMutableArray *newAxes = [graph.axisSet.axes mutableCopy]; 

    [newAxes addObject:rightY]; 

    graph.axisSet.axes = newAxes; 

    [newAxes release];

    [graph addPlotSpace:plotSpace1];