Wix: getting WixUI_minimal to show when bootstrapp

Question

I'm somewhat new to Wix. I created a bootstrapper to check and install .NET version 4 framework if it doesn't exist. In my msi package, I'm using WixUI_minimal installer interface. When I run the bootstrapper.exe, the standard bootstrapper UI shows instead of the WixUI_minimal. Is there a way to have WixUI_minimal present and have .NET framework install in the background without showing the bootstrapper UI? What options do I have here? Any tips would be appreciated. Thanks.

<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
  xmlns:util="http://schemas.microsoft.com/wix/UtilExtension">
  <Bundle Name="BootstrapperRedist" Version="1.0.0.0" Manufacturer="Testment Technologies" UpgradeCode="3f40cdd1-640d-4fe6-8edb-17a308d8f227">
        <BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense" />
        <Chain>
      <PackageGroupRef Id="NetFx40ClientRedist"/>
      <MsiPackage Id="MyApplication" SourceFile="$(var.MicroSynSetupProject.TargetPath)"/>
        </Chain>
    </Bundle>
  <Fragment>
    <!-- Check for .NET 4.0 -->
    <util:RegistrySearch Root="HKLM"
                         Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full"
                         Value="Version"
                         Variable="Netfx4FullVersion" />
    <util:RegistrySearch Root="HKLM"
                         Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full"
                         Value="Version"
                         Variable="Netfx4x64FullVersion"
                         Win64="yes" />
    <PackageGroup Id="Netfx4Full">
      <ExePackage Id="Netfx4Full"
                  DisplayName="Microsoft .NET Framework 4.0"
                  DownloadUrl="http://download.microsoft.com/download/5/6/2/562A10F9-C9F4-4313-A044-9C94E0A8FAC8/dotNetFx40_Client_x86_x64.exe"
                  Compressed="no"
                  Cache="yes"
                  PerMachine="yes"
                  Permanent="yes"
                  Protocol="netfx4"
                  Vital="yes"
                  SourceFile=".\dotNetFx40_Full_x86_x64.exe"
                  InstallCommand="/passive /norestart"
                  DetectCondition="Netfx4FullVersion AND (NOT VersionNT64 OR Netfx4x64FullVersion)" />
    </PackageGroup>
  </Fragment>
</Wix>

I decided to change the bootstrapper application UI to include my license, a logo and a theme. This was done by including the WixBalExtension as a reference. This seems like the simplest way to go for the moment in having one unified install UI. The new bootstrapper listing is below.

    <?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
  xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"
  xmlns:bal="http://schemas.microsoft.com/wix/BalExtension">
  <!--Version="1.0.0.0"-->
  <Bundle Name="BootstrapperRedist"
          Version="!(bind.packageVersion.MicroSyn)"
          UpgradeCode="3f40cdd1-640d-4fe6-8edb-17a308d8f227" 
          IconSourceFile=".\MS.ico">

    <BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense">
      <bal:WixStandardBootstrapperApplication
        LicenseFile=".\license.rtf"
        ThemeFile=".\RtfTheme.xml"
        LogoFile=".\MS_64x64.bmp"/>
    </BootstrapperApplicationRef>

        <Chain>
      <PackageGroupRef Id="NetFx40ClientRedist"/>
      <MsiPackage Id="MicroSyn" 
                  SourceFile="$(var.MicroSynSetupProject.TargetPath)" 
                  DisplayInternalUI="no"/>
        </Chain>
    </Bundle>
  <Fragment>
    <!-- Check for .NET 4.0 -->
    <util:RegistrySearch Root="HKLM"
                         Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full"
                         Value="Version"
                         Variable="Netfx4FullVersion" />
    <util:RegistrySearch Root="HKLM"
                         Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full"
                         Value="Version"
                         Variable="Netfx4x64FullVersion"
                         Win64="yes" />
    <PackageGroup Id="Netfx4Full">
      <ExePackage Id="Netfx4Full"
                  DisplayName="Microsoft .NET Framework 4.0"
                  DownloadUrl="http://download.microsoft.com/download/5/6/2/562A10F9-C9F4-4313-A044-9C94E0A8FAC8/dotNetFx40_Client_x86_x64.exe"
                  Compressed="no"
                  Cache="yes"
                  PerMachine="yes"
                  Permanent="yes"
                  Vital="yes"
                  SourceFile=".\dotNetFx40_Full_x86_x64.exe"
                  InstallCommand="/passive /norestart"
                  DetectCondition="Netfx4FullVersion AND (NOT VersionNT64 OR Netfx4x64FullVersion)"/>
    </PackageGroup>
  </Fragment>
</Wix>

Answer 1

On your MSI package you would need to set the attribute DisplaysInternalUI to Yes.

From the documentation:

Specifies whether the bundle will show the UI authored into the msi package. The default is "no" which means all information is routed to the bootstrapper application to provide a unified installation experience. If "yes" is specified the UI authored into the msi package will be displayed on top of any bootstrapper application UI.

http://wixtoolset.org/documentation/manual/v3/xsd/wix/msipackage.html