<mx:ProgressBar id="progressBar1" barSkin="your.company.assets.skins.MyProgressBarSkin" ...
<fx:Style> @namespace s "library://ns.adobe.com/flex/spark"; @namespace mx "library://ns.adobe.com/flex/mx"; .progressBarSyle { /* TODO: define style here */ } </fx:Style> ... <mx:ProgressBar id="progressBar2" styleName="progressBarSyle"
Not sure what is different about a "Gmail" style, but have you looked here:http://forums.arcgis.com/threads/57341-how-to-implement-a-quot-Loading-quot-message-after-a-layer-is-checked-in-the-TOC?highlight=progress+bar
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