How to remember checkbox values for each image

The situation is this: i have a horizontal list which i
populate with images loaded from xml. After i click on any of the
images, popup windows is displayed with checkbox. The same popup is
displayed for all of the images after i click on them. I need to
remember checkbox values (on/off) for each one of the images in
horizontal list but i don't know how to do that? How can i know
which one of the images (they are different) inside horizontal list
i clicked on in the first place?
thank you

I am sorry but i don't quite follow you, i am not sure what
you are saying so i would really appreciate it if you could explain
it to me a little bit further. I have the following mxml code where
i define my HorizontalList:
<mx:HorizontalList height="326" width="935" id="imageList"
itemRenderer="mx.controls.Image" columnWidth="427" rowHeight="320"
itemClick="popUpWindow()" backgroundColor="#4A4A4A"
borderColor="#444242" themeColor="#000000" verticalCenter="166"
horizontalCenter="0">
</mx:HorizontalList>
and following "popUpWindow()" function which i call when
image in HorizontalList is clicked:
//previously i populate horizontal list with images from an
array "slidePathAC"
imageList.dataProvider = slidePathAC;
public function popUpWindow():void{
trace ("\npopUpWindow function")
var tw:TitleWindow = new TitleWindow();
tw.showCloseButton = true;
tw.setStyle("borderAlpha",0.9);
mx.managers.PopUpManager.addPopUp(tw, MainPanel, true);
tw.width = 500;
tw.height = 500;
mx.managers.PopUpManager.centerPopUp(tw);
tw.addEventListener("close",removePopUp);
Thank you very much for your help

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    Use Set Waveform Attribute on each channel of your data.  Set an attribute with name "NI_ChannelName".  The value is a string containing the name you wish to call the channel.
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