Add blur effect on background while focusing the navigate page

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Visual-Studio

XAML

WPF

VS2010

Hi all,

I'm using WPF and create a page that not have the page border(for touch screen display).

Situation: Right now I'm in SelectPaymentScreen and when user not respond to the page, it will start the timer and when the timer is stop, it will navigate to TimeOutScreen. When the TimeoutScreen appear, it will show a page that as user whether to continue or not.. My target is when the TimeoutScreen appear, the background page (SelectPaymentScreen) is blur. Fyi, the TimeoutScreen is small for displaying the confirmation only..

So anyone here could guide to do this..?

Whether it need to code in TimeoutScreen.xaml or in TimeoutScreen.xaml.vb

**I'm sorry, I've try to search in Google but seems like it doesn't work for my code