Here is my xaml for it
 <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}" IsHitTestVisible="True" >
                        <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>