Why BackKeyPress can not execute in WP7 - windows-phone-7

I found a weird thing in WP7.When the virtual keyboard display in the page,the page's BackKeyPress event can't execute. Can anybody know why?

When the virtual keyboard display in the page, you Press the Back Device Button. Firstly the virtual keyboard will disappear. And if you press the Back Device Button again the BackKeyPress will fire.

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Thanks

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I am implementing search functionality on a given list,and the requirement is: right at the moment while search button is pressed the search textbox will be focused and the onscreen softkeyboard will be available. Creating focus is easy but Any idea guys how could display the onscreen keybard?
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I am working on an application in Windows Phone 7.1. I have a page with textbox and button to take input from user. Today suddenly my on-screen keyboard (shown when clicked on textbox) is not working. Button click is also not hitting the method in codebehind. It was working when last time I worked on app. I created another app and tested that on screen keyboard and button clicks are working there. Has someone else faced this issue and is anybody having any idea what's going wrong?
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