var GoogleChartURL                    = "http://chart.apis.google.com/chart",
    CPGoogleVeriticalStackedBarChart  = @"bvs",
    CPGoogleHorizontalStackedBarChart = @"bhs"
    CPGoogleVeriticalGroupedBarChart  = @"bvs",
    CPGoogleHorizontalGroupedBarChart = @"bhs",
    CPGoogleLineChart                 = @"lc",
    CPGooglePieChart                  = @"p",
    CPGooglePieChart3D                = @"p3";
 
...
 
+ (id)withFrame:(CGRect)aFrame type:(CPString)aType
{
    return [[self alloc] initWithFrame:aFrame type:aType];
}