Uncaught JavaScript exception [this.getOptionDataSource() is null]

[matucasal]

I am trying to add a select item (combobox) in the calendar event editor

	SelectItem claseName = new SelectItem("clase");
		claseName.setTitle("Clase:");
		claseName.setPickListWidth(250);
		claseName.setOptionDataSource(ClaseDS.getInstance());
		// DynamicForm form = new DynamicForm();
		// form.setFields(claseName);

		calendar.setEventEditorFields(claseName);

But the DS is not loaded, I have this erros

[ERROR] - 13:24:21.030:MUP9:WARN:SelectItem:isc_SelectItem_15:fetchData() called for a non-databound pickList. Ignoring

[ERROR] - 13:24:22.763:WARN:Log:TypeError: this.getOptionDataSource() is null
    unnamed() @ pro/sc/modules/ISC_Forms.js:1985
    unnamed(undef, null, undef) @ pro/sc/modules/ISC_Forms.js:1982
    SelectItem.makePickList(_1=>undef, undefined=>null, undefined=>undef) @ pro/sc/modules/ISC_Forms.js:2089
    unnamed() @ pro/sc/modules/ISC_Forms.js:1977
    SelectItem.showPickList() @ pro/sc/modules/ISC_Forms.js:2066
    SelectItem.handleClick(=>{Obj}, undefined=>undef, undefined=>undef, undefined=>undef) @/sc/modules/ISC_Forms.js:2059
    DynamicForm.bubbleItemHandler(_1=>{Obj},  _2=>"handleClick",  _3=>{Obj}) @ pro/sc/modules/ISC_Forms.js:647
    DynamicForm.handleClick(_1=>{Obj},  _2=>undef) @ pro/sc/modules/ISC_Forms.js:656
    [c]EventHandler.bubbleEvent(_1=>{Obj},  _2=>"click") @ pro/sc/modules/ISC_Core.js:1535
    [c]EventHandler.handleClick(_1=>{Obj}) @ pro/sc/modules/ISC_Core.js:1383
    EventHandler._handleMouseUp([object MouseEvent], undef) @ pro/sc/modules/ISC_Core.js:1370
    [c]EventHandler.handleMouseUp(_1=>[object MouseEvent]) @ pro/sc/modules/ISC_Core.js:1361
    [c]EventHandler.dispatch(_1=>isc_c_EventHandler_handleMouseUp,  _2=>[object MouseEvent]) @ pro/sc/modules/ISC_Core.js:1598
    anonymous([object MouseEvent]) @ pro/sc/modules/ISC_Core.js:38
    unnamed() @

I tried the same select item in other place and it works

Does anyone know how to solve my problem?
Thanks!

[atomatom]

I'm seeing this too on the latest nightly Pro.

It was fixed using this

  selectItem.setAttribute("optionDataSource", dataSource.getID());

[sjivan]

This is fixed in the latest nightly.

Sanjiv