By default Silverlight combo box and list box does not support keyboard selection, so we need custom solution, “Mr Fons Sonnemans” has done a fantastic job of achieving the behavior with adding behavior to the controls.
Here is the original post “Keyboard selection on Silverlight ListBox and ComboBox“
There is a sample project added with the post. its totally reusable and fantastic. We have used it in our project and also recommend that people should use it.
Thumbs Up “Mr Fons Sonnemans” .