HOW TO change the StartPage of the Windows Phone 7 Application in Visual Studio 2010 [VB.NET]

Expand the My Project folder into Solution Explorer of the Visual Basic Windows Phone Application Project and Open the WMAppManifest.xml file.
Change the NavigationPage with you new StartPage filename (case sensitive).

    <Tasks>
      <DefaultTask  Name ="_default" NavigationPage="MainPage.xaml"/>
    </Tasks>

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Windows Phone Software Development Kit (SDK) 7.1 Release Candidate (RC) – “Windows Phone 7 SDK – Visual Studio setup cannot run in compatibility mode. For more information see the ‘Installing’ section in the Visual Studio Readme at “http://go.microsoft.com/fwlink/?LinkId=143397″.”

When you launch the SDK installation from the ‘vm_web2.exe’ file show the following error:

Windows Phone 7 SDK – Visual Studio setup cannot run in compatibility mode. For more information see the ‘Installing’ section in the Visual Studio Readme at http://go.microsoft.com/fwlink/?LinkId=143397.

Solution:

Right-click vw_web2.exe then click Properties
On the Compatibility tab uncheck “Run this program in compatibility mode for”, press Apply then click OK.

Note: if the chebox is disabled press the button “Show settings for all users” in the bottom of the Properties dialog then uncheck “Run this program in compatibility mode for”, press Apply then click OK.

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