Locate widget
http://resources.arcgis.com/en/help/flex-viewer/concepts/
The Locate widget (a.k.a., geocoding widget) enables end users to find a location on the displayed map content in the Viewer. The widget provides two ways to find a location: entering an address or specifying longitude/latitude coordinate values. It works with geocoding services from both ArcGIS Server and Bing maps.
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The matching geocoded result(s) are returned as a list in the widget, under the Results tab. They are ordered in the list based on their geocoding match scores, with the highest scoring result at the top. When a location matches with a score of 100, the map display zooms to its location. A locate symbol is placed on the map along with an Info Popup window for the matching record.
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Each result in the geocoded result list has a red circle "x" icon. Clicking it will remove the returned result from the list.
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The Locate widget works with one geocoding service. For multiple geocoding services, for example: one for North America and another for Europe, each requires its own locate widget in the Viewer. And each locate widget would have its own unique configuration file.
Test drive the Locate widget or read its tag reference.