How to hide certain items in a Combo Box

I've two Combo Box(CB). First CB contain 4 items(drop-down menus) and the 2nd CB contain 12 items.
I want that when I select one of the items from Combo Box1, then only 4 out of 12 items from Combo Box2 should be visible. So actually I want first combo Box to act as filter. Could this be done using the AS3 code.

I don't think there is any way to hide items, but you can rewrite he items basd on the selectedIndex value of the cbHeight combobox.  In the code below, each element of the weightData array is an array of objects.
import fl.data.DataProvider;
var weightData:Array = new Array(); 
weightData.push([{label: "100"},{label: "110"},{label: "120"},{label: "130"}]);
weightData.push([{label: "200"},{label: "210"},{label: "220"},{label: "230"}]);
weightData.push([{label: "300"},{label: "310"},{label: "320"},{label: "330"}]);
function heightSelected(evt:Event):void
     var hSelected:int = evt.target.selectedIndex;
     var dp:DataProvider = new DataProvider(weightData[hSelected]);
      cbWeight.dataProvider = dp;

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