[flexcoders] LInkButton in ActionScript--how to write the attribute 'icon" in Action Script -----PLEASE ANY HELP

[Nini7016 Nini7016]

Hello 

I have this code in MXML file : 
       [Bindable]
        public var start :Class = BpmnResource.getInstance().icon_tool_start;

.....
   <mx:LinkButton id="btn" icon="{iconClass}" width="20" height="20" 
buttonMode="false" />

I would like to transform it in Action script 

           [Bindable]
        public var start :Class = BpmnResource.getInstance().icon_tool_start;
.........
            var icon_start : LinkButton = new LinkButton();
            icon_start.buttonMode = false;
            icon_start.height = 20;
            icon_start.width = 20;
           
But i don't find the equivalent of icon="{iconClass}" in ActionScript :( :( :( 

Any Help please please 

Thank you very much 
                                          
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