dataBinding on Combobox

Hi Guys,

I've the below databinding on a combobox and the issue that the binding is coming with the display value of my levels so eg. I'm getting normal instead of 1 which mean the combobox in my form is not showing, so how get the binding to bring the VALUELIST rather then DISPLAYLIST ?  

Property Level As %String(DISPLAYLIST = ",Normal,Dangerous,", VALUELIST = ",1,2,3");
 

<combobox dataBinding="levels" label="levels :" dropdownHeight="130px" dropdownWidth="230px">
  <option value="1" text="normal"/>
  <option value="2" text="dangerous"/>
  <option value="3" text="Extreme"/>
  </combobox>

Thanks