Windows Phone webview flickering when keyboard is shown - windows-phone-8

I'm now developing a webapp for Windows Phone 8 with Microsoft Visual Studio Express 2012 for Windows Phone. I have a fullscreen webview that load html content from the web.
In the css of the html content there is this code:
#-ms-viewport{
width:850px;
user-zoom:fixed;
max-zoom:1;
min-zoom:1;
}
When the keyboard show up, there is an horrible flickering effect of a strange black rectangle.
I have only the webview component in the code and I use VB. There is any type of solution to fix this flickering effect?
Thank you

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View my site here--
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