Cancel a ProgressEvent from another 'loading window'

i'd know how, if possible, how cancel progressevent.progress or how cancel 'loading' process in general.

i want know how class, happens create 'loading window' cancel button should able cancel if loading taking long liking.

var msg:msgclass = new msgclass();//*********** creates window message if errors happen.

var winloading:winloadingclass = new winloadingclass();//*********** creates window loading bar , cancel button

winloading.win()//***********activates loading window

dispatcher.addeventlistener(progressevent.progress, progresshandler);

dispatcher.addeventlistener(securityerrorevent.security_error, securityerrorhandler);

dispatcher.addeventlistener(httpstatusevent.http_status, httpstatushandler);

dispatcher.addeventlistener(ioerrorevent.io_error, ioerrorhandler);

dispatcher.addeventlistener(event.complete, completehandler)

function completehandler(event:event){winloading.winclose()}

function progresshandler(event:progressevent):void{if (event.bytesloaded == event.bytestotal){winloading.winclose()}}

function securityerrorhandler(event:securityerrorevent):void{msg.win('security error');}

function httpstatushandler(event:httpstatusevent):void{if (event.status != 200){msg.win('connection server lost');}}

function ioerrorhandler(event:ioerrorevent):void{winloading.winclose();msg.win('io error');}

any appreciated

the loader class has close() method. in documentation if need more information. also, remove progress listener.

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