No themes for WPF applications under Vista

Hi,

I upgraded a VB2005 Express project with Orcas Beta 2 running in Vista Ultimate. The project is WPF. Everything runs fine except that the app no longer has any theme. I do use a manifest for the app and the theming is totally ok with VBExpress2005. The exe.manifest of the app is like this:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urnchemas-microsoft-com:asm.v1" manifestVersion="1.0">
<assemblyIdentity
version="1.0.0.0"
name="MyApp"
processorArchitecture="x86"
type="win32"
/>
<description></description>
<dependency>
<dependentAssembly>
<assemblyIdentity
type="win32"
name="Microsoft.Windows.Common-Controls"
version="6.0.0.0"
processorArchitecture="x86"
publicKeyToken="6595b64144ccf1df"
language="*"
/>
</dependentAssembly>
</dependency>
</assembly>

Is this a bug of Beta 2 or has something been changed with .net 3.5 ? Please kindly advise.

[1324 byte] By [FrancisShum] at [2008-2-8]