here's what my xaml look like:
<esri:Map.Layers>
<esri:ArcGISDynamicMapServiceLayer ID="BaseLayer" Url="{StaticResource WDPurl}"></esri:ArcGISDynamicMapServiceLayer>
<esri:GraphicsLayer ID="MyGraphicsLayer">
</esri:GraphicsLayer>
<esri:FeatureLayer ID="MyFeatureLayer" Url="{StaticResource FacilitiesLayerID}" FeatureSymbol="{StaticResource DefaultNoMarkerSymbol}" >
<esri:FeatureLayer.OutFields>
<sys:String>FACILITYNAME</sys:String>
<sys:String>SITEFROM</sys:String>
<sys:String>SITESTREET</sys:String>
<sys:String>SITEDIRECTION</sys:String>
<sys:String>SITECITY</sys:String>
<sys:String>FACILITYNUMBER</sys:String>
</esri:FeatureLayer.OutFields>
<esri:FeatureLayer.MapTip>
<Border esri:GraphicsLayer.MapTipHideDelay="00:00:01.5" Style="{StaticResource CommonBorder}" Padding="10,3,10,3" Effect="{StaticResource dropShadow}" >
<StackPanel Orientation="Vertical" Margin="20,15,20,15">
<StackPanel Orientation="Horizontal" Margin="0,0,0,6">
<TextBlock Text="Name: " FontWeight="Bold" Foreground="#FF0F274E" FontSize="12" />
<TextBlock Text="{Binding Converter={StaticResource MyDictionaryConverter},
ConverterParameter=FACILITYNAME, Mode=OneWay}" Foreground="#FFFFFFFF" FontSize="12" FontFamily="Portable User Interface" />
</StackPanel>
<StackPanel Orientation="Horizontal" Margin="0,0,0,6">
<TextBlock Text="Address: " FontWeight="Bold" Foreground="#FF0F274E" FontSize="12" />
<TextBlock Text="{Binding Converter={StaticResource MyDictionaryConverter},
ConverterParameter=SITEFROM, Mode=OneWay}" Foreground="#FFFFFFFF" FontSize="12" FontFamily="Portable User Interface" />
<TextBlock Text=" " />
<TextBlock Text="{Binding Converter={StaticResource MyDictionaryConverter},
ConverterParameter=SITESTREET, Mode=OneWay}" Foreground="#FFFFFFFF" FontSize="12" FontFamily="Portable User Interface" />
<TextBlock Text=" " />
<TextBlock Text="{Binding Converter={StaticResource MyDictionaryConverter},
ConverterParameter=SITEDIRECTION, Mode=OneWay}" Foreground="#FFFFFFFF" FontSize="12" FontFamily="Portable User Interface" />
</StackPanel>
<StackPanel Orientation="Horizontal" Margin="0,0,0,6">
<TextBlock Text="***************" FontWeight="Bold" Foreground="#FF0F274E" FontSize="12" />
<TextBlock Text="{Binding Converter={StaticResource MyDictionaryConverter},
ConverterParameter=SITECITY, Mode=OneWay}" Foreground="#FFFFFFFF" FontSize="12" FontFamily="Portable User Interface" />
</StackPanel>
<StackPanel>
<!--<TextBlock Text="Inspection Results" Name="InspectionTextBlock" Cursor="Hand" TextDecorations="Underline" MouseLeftButtonDown="InspectionTextBlock_MouseLeftButtonDown" Foreground="#FF0F274E" FontSize="12"/>-->
<!--<HyperlinkButton x:Name="InspectionHyperlinkButton" TargetName="_blank" Content="{Binding Converter={StaticResource MyDictionaryConverter},ConverterParameter={StaticResource InspectionPage}}" NavigateUri="{Binding Converter={StaticResource MyDictionaryConverter},ConverterParameter={StaticResource InspectionPage}}" ></HyperlinkButton>-->
<HyperlinkButton x:Name="InspectionHyperLinkButton" TargetName="_blank" Content ="Inspection Report" NavigateUri="{Binding Converter={StaticResource UriConverter1}, ConverterParameter=FACILITYNUMBER}" Foreground="#FF0F274E" FontSize="12"/>
</StackPanel>
</StackPanel>
</Border>
</esri:FeatureLayer.MapTip>
</esri:FeatureLayer>
</esri:Map.Layers>