I have a list with some strings. I want to create filter like the people hub(or programs menu) has with filter by first letter. How to create such thing for a list?

I have a list with some strings. I want to create filter like the
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Use the
LongListSelectorfrom the Silverlight toolkit.There’s a great walkthrough at http://www.windowsphonegeek.com/articles/LongListSelector-walkthrough