FusionCharts: cannot style parts of the chart

Question

I am using JSON format to style a FusionChart. When I change the properties of the chart as whole, the changes show up on the chart. However, when I change the individual elements (using the format found here, under the heading "Using Styles to specify font properties for individual titles") the changes do not show up on my chart.

Here is my code:

dataSource: {
            //works    
            chart: {
                    paletteColors: PALETTE_COLORS,
                    showBorder: "0",
                    formatNumber: "1",
                    formatNumberScale: "0",
                    numberPrefix: '$',
                    labelSepChar: ': ',
                    toolTipSepChar: ': ',
                    bgColor: 'FFFFFF',
                    seriesNameInToolTip: "0",
                    decimals: options.unit() === 'ppd' ? 2 : 0,

                    showLegend: options.showBudget() ? "1" : "0"
                },
                //doesn't work
                styles: {
                    definition: [{
                        name: "myDataValuesFont",
                        type: "font",
                        size: "24"
                    }]
                },
                application: [{
                    toobject: "tooltip",
                    styles: "myDataValuesFont"
                }]
            }

What am I doing wrong?