Create and Control Resizable Containers

           
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Canvas width="400" height="300" verticalScrollPolicy="off" horizontalScrollPolicy="off">
        <mx:Script>
            
    
                private function startResize():void
                {
                    stage.addEventListener(MouseEvent.MOUSE_MOVE, resize);
                    resizeIcon.addEventListener(MouseEvent.MOUSE_UP, stopResize);
                    resizeIcon.addEventListener(MouseEvent.ROLL_OUT, stopResize);
                    resizeIcon.startDrag();
                }
        
        
                private function stopResize(mouseEvent:MouseEvent):void
                {
                    resizeIcon.removeEventListener(MouseEvent.MOUSE_UP, stopResize);
                    resizeIcon.removeEventListener(MouseEvent.ROLL_OUT, stopResize);
                    stage.removeEventListener(MouseEvent.MOUSE_MOVE, resize);
                    resizeIcon.stopDrag();
                }
        
        
                private function resize(mouseEvent:MouseEvent):void
                {
                    this.explicitHeight = resizeIcon.y + resizeIcon.height + 10;
                    this.explicitWidth = resizeIcon.x + resizeIcon.width + 10;
                }
    
          
        </mx:Script>
        <mx:Panel width="60%" height="60%" top="20" left="20"/>
        <mx:Image id="resizeIcon" source="@Embed('a.jpg')" mouseDown="startResize()" x="360" y="260"/>
    </mx:Canvas>
</mx:Application>

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Create and Control Resizable Containers : Layout « Container « Flex

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