How to change TextSymbol color when its Graphic is selected?

Question

I tried to follow the sample Graphics/Selections (http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SelectGraphics) to make a TextSymbol, but the Graphic will show nothing with this TextSymbol. Please help: TextSymbol textSymbol = DefaultTextSymbol; textSymbol.Text = "xyz; graphic.Symbol = textSymbol; MyGraphicsLayer.Graphics.Add(graphic);

ChenLi · Answer

After the machine reboot, the above XAML works. Don't know why.
Thank you, Dominique, the text graphic is added to a graphicLayer by Draw.DrawMode = DrawMode.Point.
Chen Li

DominiqueBroux · Answer

One issue is that you didn't bind the Textblock to Symbol.Text: 
<TextBlock x:Name="Element" FontFamily="Arial" FontSize="16" Foreground="Red"  Text="{Binding Symbol.Text}">

That being said, it doesn't fully explain your issue because you shoud get a fixed string : "ABC".
 
Perhaps an issue with the geometry of your graphic. How did you initialize it?