How to set a default value in a Value Help Drop Down List

Hi,

I used an age Range field in my adobe form, the control is a Value Help Drop Down List. i am populating the drop down using following code.

IWDAttributeInfo ageInfo = wdContext.nodePersonalData().getNodeInfo().getAttribute("CTAgeRange");

ISimpleTypeModifiable ageType = ageInfo.getModifiableSimpleType();

IModifiableSimpleValueSet ageValueSet = ageType.getSVServices().getModifiableSimpleValueSet();

ageValueSet.put("1","21-29");

ageValueSet.put("2","30-34");

ageValueSet.put("3","35 or Above");

My requirement is to set a default value e.g. 30-34 in the age range field.

I want to give input to iform from my Implementation code only.

Please help.

Thanks in advance