flex - flex4 change custom btn icon -


i followed post here custom iconbutton using flex4 link text however, want change icon of buttom @ run time, create in actionscript :

[bindable] [@embed('assets/1.png')] public var pic1:class;  [bindable] [@embed('assets/2.png')] public var pic2:class;  public function clicktochange()   {custombtn1.setstyle("icon", pic2);}

and .mxml 

<local:custombtn id="custombtn1" icon='{pic1}' width="80" height="80" click=clicktochange();/>

but can't custombtn change pic1 pic2 when click it. hint part did wrong? thanks.

simply: 

custombtn1.icon = pic2;

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