* @return The found {@link IFieldWidget}
* @throws BindingException When the field can't be found
*/
private IFieldWidget<?> resolveFieldWidget(String fieldName) throws BindingException {
final IFieldWidget<?> fw = widget.getFieldGroup().getFieldWidget(fieldName);
if(fw == null) throw new BindingException("Field of name: " + fieldName + " was not found.");
return fw;
}