fires when the user clicks the Today or Clear buttons
| date | Date | the selected date (for the Today button) or NULL (for the Clear button) | 
myCalendar.attachEvent("onButtonClick", function(date){
    if (date == null) {
        // clear button
    } else {
        // today button
    }
    // hide calendar if needed
    this.hide();
});
added in 4.6.1
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