The above example shows you how to create `PieChart` using ChartJs package. In this example, for purpose of chart demonstration only, we do use mock-up data from array. As you can see, the KoolReport's widget in general support dataSource could be DataStore, Process, DataSource or even simple array.
This example shows how to build a line chart with modified tooltip interface using the `custom` property.
For example:
...
"tooltips" => array(
...
"custom" => " function(tooltip) {
...
}
)
...