Remove 'Choose one ' option from Wicket DropDownChoice?

Wicket Framework DropDownChoice component has default 'Choose one' value by default. To remove that add a override method following:

List<String>employeeNameList=new ArrayList<String>();
employeeNameList.add("Soora");
employeeNameList.add("padman");
employeeNameList.add("kiran");

 DropDownChoice employeeNameList = new DropDownChoice("employees",employeeNameList) {

  @Override
            protected CharSequence getDefaultChoice(String selectedValue) {
// put return type as empty so that default value will be removed
                return " ";
            }

}