I have made a WiX-Bootstrapper bundle with some prerequisites, per example IIS Express 8.0. On a virtual machine the installation of IIS goes well. In the next step, i want to activate some of the IIS-features. So i tried the following lines in the Product.wxs of the MSI-project:
<Product>
    [...]
    <Property Id="INSTALLIISPROP"
              Value="C:\Windows\System32\dism.exe"></Property>
    <CustomAction Id="InstallIISCA"
                  Return="check"
                  Property="INSTALLIISPROP"
                  Execute="deferred"
                  HideTarget="yes"
                  Impersonate="yes"
                  ExeCommand="/Online /Enable-Feature /FeatureName:IIS-WebServerRole /FeatureName:IIS-WebServer /FeatureName:IIS-CommonHttpFeatures /FeatureName:IIS-StaticContent /FeatureName:IIS-DefaultDocument /FeatureName:IIS-RequestFiltering /FeatureName:IIS-IPSecurity [...]></CustomAction>
    <InstallExecuteSequence>
        <Custom Action="InstallIISCA"
                Before="InstallFinalize">
            <![CDATA[NOT Installed AND IISMAJORVERSION]]>
        </Custom>
    </InstallExecuteSequence>
</Product>
But this does nothing. None of the IIS-features is activated. What have i done wrong?
Here at last the WXS-file for the IIS-Installation:
<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
     xmlns:util="http://schemas.microsoft.com/wix/UtilExtension">
    <Fragment>
        <util:RegistrySearch Root="HKLM"
                             Key="SOFTWARE\Microsoft\InetStp\Components"
                             Value="Install"
                             Variable="IisExpressX64"
                             Win64="yes"/>
        <util:RegistrySearch Root="HKLM"
                             Key="SOFTWARE\Microsoft\InetStp\Components"
                             Value="Install"
                             Variable="IisExpressX86"/>
        <PackageGroup Id="IisExpress_8_0">
            <MsiPackage Id="IisExpress8_0_X64"
                        Cache="yes"
                        Compressed="yes"
                        Permanent="yes"
                        Vital="yes"
                        SuppressSignatureVerification="yes"
                        SourceFile=".\Prerequisites\iis\iisexpress_8_0_RTM_x64_de-DE.msi"
                        InstallCondition="NOT IisExpressX86 AND VersionNT64"/>
            <MsiPackage Id="IisExpress8_0_X86"
                        Cache="yes"
                        Compressed="yes"
                        Permanent="yes"
                        Vital="yes"
                        SuppressSignatureVerification="yes"
                        SourceFile=".\Prerequisites\iis\iisexpress_8_0_RTM_x86_de-DE.msi"
                        InstallCondition="NOT IisExpressX86 AND NOT VersionNT64"/>
        </PackageGroup>
    </Fragment>
</Wix>
And it is referenced in the Bundle.wxs:
<PackageGroupRef Id='IisExpress_8_0'/>