Memory leak with mx:ComboBox ???

hi,
i test flex framework. created simple application. join mxml code below:

<?xml version="1.0" encoding="utf-8"?>
<mx:application
xmlns:mx=" http://www.adobe.com/2006/mxml">
<mx:arraycollection id="combodata">
<mx:array>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
<mx:object label="new york" data="ny"/>
<mx:object label="connecticut" data="ct"/>
<mx:object label="illinois" data="il"/>
</mx:array>
</mx:arraycollection>
<mx:combobox dataprovider="{combodata}"/>
</mx:application>

if run application, give focus combox without make visible dropdownlist (pressing key "tab"),
and browse items using "up" , "down" keys, notice browser memory increasing (400 ko each time press key) !!!

i use winxp sp2, mozilla firefox 1.0.

it normal?

i compiled source using flex online compiler , generated application haven't memory leak...
i notice .swf file size bigger (+6 ko).

here animation generated flex online compiler (198 ko)
here animation generated flex builder trial version (192 ko)

can explain diffrence?

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