A 2-sided track's Thumb, with a list of items in center, forces the tumb to jump on selected item

Question

With Adobe Catalyst, you can create nifty VerticalScrollBars for DataLists. I've create a thumb of the verticalscroll bar as two images (left & right of track).  When I click on an item in the list, the thumb listens to the mouse on the track and tries to scroll to that area, instead on selecting the ticket.
Check the image for a clearer explanation:
In the Code of the Skin of List:
<s:VScrollBar fixedThumbSize="true" skinClass="components.VerticalScrollbar1" x="0" y="0" viewport="{dataGroup}"/>
And the Skin VerticalScrollBar1:
<?xml version="1.0" encoding="utf-8"?>
<s:Skin xmlns:s="library://ns.adobe.com/flex/spark" xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:d="http://ns.adobe.com/fxg/2008/dt">
<fx:Metadata>[HostComponent("spark.components.VScrollBar")]</fx:Metadata>
<s:states>
<s:State name="normal"/>
<s:State name="disabled"/>
<s:State name="inactive"/>
</s:states>
<s:Button skinClass="components.Track1" x="7" y="0" id="track"/>
<s:Button skinClass="components.Thumb1" x="0" y="104" id="thumb"/></s:Skin>
and the Thumb1:
<?xml version="1.0" encoding="utf-8"?>
<s:Skin xmlns:s="library://ns.adobe.com/flex/spark"     xmlns:fx="http://ns.adobe.com/mxml/2009"     xmlns:d="http://ns.adobe.com/fxg/2008/dt" xmlns:graphics="assets.graphics.*">
<fx:Metadata>[HostComponent("spark.components.Button")]</fx:Metadata>
<s:states>
<s:State name="up"/>
<s:State name="over"/>
<s:State name="down"/>
<s:State name="disabled"/>
</s:states>
<graphics:Graphic2 x="0" y="0" d:userLabel="ThumbLeft"/>
<graphics:Graphic1 x="146" y="0" d:userLabel="ThumbRight"/>
</s:Skin>
Notice that there are two thumbs, and an empty area in the middle, in the hope that it would ignore the mouse of that area where the items are located.

Answer 1

Here's a sample script that first defines a list of items in an array and uses it to update a number of dropdowns, name dd1...dd10:
// Populate an array with the list items
var aItems = ["-- Select a state --", "Alaska", "Hawaii", "Washington", "Oregon", "Idaho", "Montana", "Wyoming", "Nevada", "Colorado", "Arizona", "New Mexico"];
// Loop through the dropdowns...
for (var i = 1; i < 11; i += 1) {
    // ...and set the list items
    getField("dd" + i).setItems(aItems);
That's all there is to it. This can be run from the Mouse Up event of a temporary button that you create, the interactive JavaScript console (Ctrl+J), etc.
More info on setItems: http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/JS_API_AcroJS.88.752.html