Combo box interaction

programming flash
1

I have 4 combobox

var solvent:Array = ["Select one", {data:"etanol", label:"Etanol"}, {data:"heksana", label:"Heksana"}, {data:"etilasetat", label:"Etilasetat"}];
var ratio:Array = ["Select one", {data:"2", label:"1:2"}, {data:"3", label:"1:3"}, {data:"4", label:"1:4"}];
var temperature:Array = ["Select one", {data:"25", label:"25° C"}, {data:"40", label:"40° C"}, {data:"100", label:"100° C"}];
var time:Array = ["Select one", {data:"8", label:"8 Hours"}, {data:"12", label:"12 Hours"}, {data:"24", label:"24 Hours"}];

and I want to add listener so the four of them can interact and get the result when I press result button like this

var boxValue:Object = new Object();
boxValue.change = function (ValueObject)
{
	solventBoxValue = solventBox.selectedItem().data;
	ratioBoxValue = ratioBox.selectedItem().data;
	temperatureBoxValue = temperatureBox.selectedItem().data;
	timeBoxValue = timeBox.selectedItem().data;
	checkValue();
};

function checkValue()
{
	userChoice = solventBoxValue+ratioBoxValue+temperatureBoxValue+timeBoxValue;
	trace (userChoice);
	switch (userChoice)
	{
	case "etanol2258" :
		trace("9.3");
		break;
	case "etanol22512" :
		trace("12.9");
		break;
	case "etanol22524" :
		trace("13.5");
		break;
           etc-etc
	default :
		trace("no combination found");
		break;
	}
}

Button_Result.onRelease = function()
{
	checkValue();
}

but, the result is always the default “no combination found”
Please, help.