Hi,

You can try ItemGroup in your csproj/vbproj:

<ItemGroup>
        <Res Include = "Strings.fr.resources" >
            <Culture>fr</Culture>
        </Res>
        <Res Include = "Dialogs.fr.resources" >
            <Culture>fr</Culture>
        </Res>

        <CodeFiles Include="**\*.cs" Exclude="**\generated\*.cs" />
        <CodeFiles Include="..\..\Resources\Constants.cs" />
    </ItemGroup>

Be careful, wrong settings in project will cause it unable to be loaded.

For more details:

 http://msdn.microsoft.com/en-us/library/646dk05y.aspx

I hope this can be helpful for you.