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How to override default tooltip format using tooltipShowing event for igDataChart

I am trying to use the tooltipShowingevent to override the tooltip displayed when the mouse hovers over a chart column. A valid HTML string is returned to tooltip from GetChartTooltip (a function I created), however, the column tooltip is still the default tooltip defined within Infragistics rather than my modified tooltip. How can I get my custom tooltip to be displayed?

tooltipShowing: function (evt, ui) {
// Programmatically set the tooltip
var tooltip = GetChartTooltip(ui);
if (tooltip != '') {