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copied!<p>For others who come across this later, I made my own custom component that just hides the checkbox for the third state and replaces it with an image that looks like a checkbox in the third state. This is really easy to implement:</p> <pre><code><?xml version="1.0" encoding="utf-8"?> <s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"> <fx:Script> <![CDATA[ public static const BOX_CHECKED:int = 1; public static const BOX_REJECTED:int = -1; public static const BOX_UNCHECKED:int = 0; [Bindable] public var boxVisible:Boolean = true; [Bindable] public var enum_id:int = -1; protected function checkbox_clickHandler(event:MouseEvent):void { if(!checkbox.selected) boxVisible = false; } protected function image_clickHandler(event:MouseEvent):void { boxVisible = true; } public function set label(str:String):void { checkbox.label = str; xLabel.text = str; } public function get boxState():int { if(checkbox.selected) return BOX_CHECKED; else if(redX.visible) return BOX_REJECTED; return BOX_UNCHECKED; } ]]> </fx:Script> <fx:Declarations>  </fx:Declarations> <s:CheckBox id="checkbox" click="checkbox_clickHandler(event)" visible="{boxVisible}" includeInLayout="{boxVisible}"/> <s:HGroup> <s:Image id="redX" source="@Embed('assets/icons/redX.png')" width="16" height="16" click="image_clickHandler(event)" visible="{!boxVisible}" includeInLayout="{!boxVisible}"/> <s:Label id="xLabel" visible="{!boxVisible}" includeInLayout="{!boxVisible}" paddingTop="4"/> </s:HGroup> </s:Group> </code></pre>

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