Don,
You should set the AutoSave to False and listen to EditEnded instead of BeginSaveEdits. Check out this forum discussion as well.
Thanks G. -Sorry for my lack of experience but I don't seem to find EditEnded. The reference to it here produces an error. <esri:FeatureLayer ID="AllAvailableFeatureLayer"
Url="http://gismaps.pagnet.org/ArcGIS/rest/services/BikeCountLocations/FeatureServer/0"
Renderer="{StaticResource AllRenderer}"
MouseLeftButtonUp="FeatureLayer_MouseLeftButtonUp"
SelectionColor="Yellow"
OutFields="Location,AMVolunteer,AMPhone,AMEmail,PMVolunteer,PMPhone,PMEmail"
DisableClientCaching="True"
Where="AMVolunteer = 'Available' and PMVolunteer = 'Available'"
AutoSave="False"
BeginSaveEdits="FeatureLayer_BeginSaveEdits"
EndSaveEdits="FeatureLayer_EndSaveEdits"
EditEnded="featureLayer_EditEnded" >