Viewer not locating Geographic Coordinates

I am on Flex Viewer 2.5 and the map is built on State Plane Coordinates.
The Locator / "Address Search" widget is not locating coordinates entered in Decimal Degrees correcty, but locates coordinates entered in SPC correctly. Any solutions for this, or must the map be in GCS?
Can I remove this search option from the widget? How?
Thanks
Lakshmi