Thank you for the reply.  Do you have an example in the 10.3 tools?  

Hello conrad1209,

If you still need any assistance on the matter, please do not hesitate to ask.

Below is the codebehind that I am using to change the caption to something else based on the element ID.  It does appear to work, however, the captions overlap, some are faded slightly and some are more bold.  How can I control that formating so they look better?  Or does that have to be done when I am creating the custom shapefile?

private void mymap_Loaded(object sender, RoutedEventArgs e)
{SampleServiceClient client2 = new SampleServiceClient();

client2.VendersListCompleted +=

new EventHandler<VendersListCompletedEventArgs>(client_VendorListCompleted);
client2.VendersListAsync();
}

void client_VendorListCompleted(object sender, VendersListCompletedEventArgs e)
{
foreach (MapElement mapE in this.mymap.Layers[0].Elements)
{
 foreach (Vendors c in e.Result)
  {if (mapE.Value == c.ID)
   {mapE.Caption = c.Vendor;}
  }
}

}