Silverlight -通过c#向Bing地图中的图钉添加文本

I was able to make my silverlight Bing map accepts Mousclicks and converts them to Pushpins in C#. Now I want to show a text next to the PushPin as a description that appears when the mouse goes over the pin , I have no clue how to do that. What are the methods that enable me to do this thing?I was able to make my silverlight Bing map acce