exit events

I have the following in LiveCycle  and the fill color changes on selection but not until you click back onto the drop down list and goes back to silver once you click out of the drop down list.   I need the fill color to remain once the value has been selected.    Can anyone help?

form1.#subform[0].DropDownList1[1]::exit - (JavaScript, client)

var vName = this.somExpression; 

var fieldObj = xfa.resolveNode(vName + ".ui.#choiceList.border.fill.color");  

if (this.rawValue == "H") { 

     fieldObj.value = "254,10,10"; 

} 

else if (this.rawValue == "M") { 

     fieldObj.value = "251,248,7"; 

} 

else if (this.rawValue == "L") { 

     fieldObj.value = "60,241,8"; 

} 

else { 

     fieldObj.value = "253,254,254"; 

}