Deselect when i click the already selected item in list component

i know list.selectedindex = -1; works when use example external buttonevent listener.

 

but want click , deselect the selected item in list component , set list selectedindex=-1

 

any clues?

use:

 

var selectedindex:int;

function f(e:mouseevent):void{

    if(e.currenttarget.selectedindex==selectedindex){

        e.currenttarget.selectedindex = -1;

    } else {

        selectedindex = e.currenttarget.selectedindex;

    }

}

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