alternativa-editor-mod/src/PopUpProgressBar.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Box xmlns:fx="http://ns.adobe.com/mxml/2009"
       xmlns:mx="library://ns.adobe.com/flex/mx"
       width="240" height="50"
       creationComplete="onCreationComplete()">

    <fx:Script>
        <![CDATA[
            import mx.controls.ProgressBar;
            import mx.controls.ProgressBarMode;
            import mx.events.FlexEvent;
            import mx.managers.PopUpManager;

            private function onCreationComplete():void {
                PopUpManager.centerPopUp(this);
                progressBar.mode = ProgressBarMode.MANUAL;
            }

            public function setProgress(value:Number, maxValue:Number):void {
                progressBar.setProgress(value, maxValue);
            }

            public function setLabel(label:String):void {
                progressBar.label = label;
            }
        ]]>
    </fx:Script>

    <!-- ProgressBar -->
    <mx:ProgressBar id="progressBar"
                   width="200"
                   label="Loading"
                   labelPlacement="top"
                   minimum="0"
                   maximum="100"
                   indeterminate="false"
                   direction="right"
                   visible="true"/>

</mx:Box>