C# - Extend Glass Frame

Helllo Everyone :)
Patric Scribe gived me a few days ago this link about Extand Glass Frame Into WPF Application.
I have been trying to expand the glass efact to all my window background but with not success.
I couldn'tunderstand how to Exptend  the glass frame with msdn tutorial, so I hope somone could help me to understed this.
Thanks alot to the helpers :)

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P.S
Sorry about my English :)