Creating Extended Value Selector (EVS) with 3 columns

Hello experts,

Does someone know how to:

Create Extended Value Selector (EVS) with 3 columns, I am trying to do this using the code bellow:

// Access interface ISimpleTypeModifiable for modifying the attribute's datatype
IWDAttributeInfo attributeInfo = wdContext.getNodeInfo().getAttribute(IPrivateMain.IContextElement.COUNTRY);
ISimpleTypeModifiable countryType = attributeInfo.getModifiableSimpleType();
// Set field label and populate valueset
countryType.setFieldLabel("Country");
IModifiableSimpleValueSet valueSet = countryType.getSVServices().getModifiableSimpleValueSet();
for (int i = 0; i < 40; i++){
valueSet.put("Key_"+i,"Country "+i);
}

On the line: valueSet.put("Key_"i,"Country "i);

We can just insert two values.

And also, I would like to insert a new value in runtime, Is it possible?

Best regards,