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Dhtmlxcolorpicker setOnCancelHandler not working.

Hello,
when I try to add onCancel event handler to colorpicker object,

cp.setOnCancelHandler(function(){
      alert("hello");
 });
   
I get the following error.
second argument to Function.prototype.apply must be an array
http://localhost:1397/dhtmlxSuite/dhtmlxColorPicker/codebase/dhtmlxcommon.js
Line 89