Wix: getting WixUI_minimal to show when bootstrapper is used - wix

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