KmlLayer is alien to me, but I see it has a MapTip property same as FeatureLayer. Here's what we've got for FeatureLayers. These two lines are present in my main MapPage.xaml.cs in an event handler for the layer Initialized event.
FeatureLayerInfo lyrInfo = fLayer.LayerInfo;
fLayer.MapTip = CreateTipWindow(lyrInfo, fLayer.OutFields);
private PopupWindow CreateTipWindow(FeatureLayerInfo lyrInfo, List<string> outFields)
{
//edited to omit details not relevent...
Dictionary<string, string> aliases = new Dictionary<string, string>();
foreach (Field f in lyrInfo.Fields)
{
if (f.Name != lyrInfo.DisplayField) aliases.Add(f.Name, f.Alias);
}
PopupWindow tipWindow = new PopupWindow() { ShowArrow = false, ShowCloseButton = false };
tipWindow.Content = CreateFeatureTipContent(outFields, aliases);
return tipWindow;
}
private FrameworkElement CreateFeatureTipContent(List<string> fields, Dictionary<string, string> aliases)
{
StackPanel stackBox = new StackPanel() { Margin = new Thickness(4, 1, 4, 1), Orientation = Orientation.Vertical };
foreach (string field in fields)
{
if (aliases.Keys.Contains(field))
{
TextBlock valueBlock = new TextBlock() { TextWrapping = TextWrapping.NoWrap };
Binding valueBinding = new Binding() { Path = new PropertyPath(string.Format("[{0}]", field)), StringFormat = aliases[field] + ": {0}" };
valueBinding.Converter = new DateTimeConverter(); //MC 2013-01 added this to tweak any Local DateTimes.
valueBlock.SetBinding(TextBlock.TextProperty, valueBinding);
stackBox.Children.Add(valueBlock);
}
}
return stackBox;
}
We are using the PopupWindow class from the ESRI.SilverlightViewer.Controls library distrubuted with this viewer (from which we've learned a great deal, BTW), but PopupWindow simply derives from ContentControl, so rolling one's own is minor, if you want.
