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dhtmlxcombo event

hi

i have a problem on following codes. i need a onChange event call another ajax function, but get a alert on the attachEvent line, it said object can not support the property or method.

var z2=dhtmlXComboFromSelect("aaa","bbb");
z2.enableFilteringMode(true);
z2.loadXML("./common/brand.jsp");
z2.attachEvent("onChange",function(event){........})

i all lost , many thanks for help.