the linkage of two select items

[fancycgx3650]

var _year = "0";
var dFormOption = isc.DynamicForm.create({
	fields:[
		{name:"FirstName", title:"year", type:"select", optionDataSource:"optionDS", optionOperationId:"FirstName", 
			changed:function(){
				_year = this.getSelectedRecord().PK;

			}
		},
		{name:"SecondName", title:"course", type:"select",
			optionDataSource:"optionDS", optionOperationId:"SecondName", optionCriteria: {FirstID: _year}
		}
	]
});

var layOutOption = isc.VLayout.create({
	width:"100%",
	height:"100%",
	autoDraw:true,
	members:[dFormOption]	
})

The SecondName will fetchData by _year,
when the FirstName changed, _year will change too
I want to update the field of SecondName immediately.
How can I do it?

[xml-leo]

changed:functin(form, item, value){
_year = this.getSelectedRecord().PK;
form.getField('SecondName').pickListCriteria= {FirstID: _year};
}

[fancycgx3650]

Great!
Thank you very much!