Josh, I'm assuming this is in regards to the new Flex Viewer...
FYI - "Zoom to full extent" functionality will be part of a Navigation Widget that we plan to include in version 2.1 of the ArcGIS Viewer for Flex.
Is there any way to bring the map to my inital extent when I click on the "Full Extent" button?
<map initialextent="-13046840 4036096 -13045400 4036867" fullextent="-13046840 4036096 -13045400 4036867" top="40">