Wix Burn: Basic UI handling if No Net Framework is there - user-interface

Question

I wrote a Boostrapper UI in C# for Net Framework 2.0 using Win-Forms. It started working fine and designed forms are responding as expected.
Here is my Wix Bundle Code:
<?define TargetFile=$(var.MyBA.TargetDir)$(var.MyBA.TargetFileName)?>
<?define BootstrapConfigFile=$(var.MyBA.ProjectDir)BootstrapperCore.config?>
<Bundle Name="Bootstrapper1" Version="1.0.0.0" Manufacturer="Farrukh" UpgradeCode="54c4a4a4-dca8-4ae4-b2f4-5e3f3fd8cb92">
<BootstrapperApplicationRef Id="ManagedBootstrapperApplicationHost">
<Payload SourceFile="$(var.BootstrapConfigFile)"/>
<Payload SourceFile="$(var.TargetFile)"/>
<Payload SourceFile="$(env.WIX)\SDK\Microsoft.Deployment.WindowsInstaller.dll"/>
</BootstrapperApplicationRef>
<WixVariable Id="WixMbaPrereqPackageId" Value="Netfx4Full" />
<WixVariable Id="WixMbaPrereqLicenseUrl" Value="NetfxLicense.rtf" />
<Chain>
<!--<PackageGroupRef Id='Netfx4Full' />-->
<MsiPackage Id="MyInstaller"
Cache="no"
Visible="yes"
DisplayInternalUI="yes"
SourceFile="MyProduct.msi"
/>
</Chain>
</Bundle>
As you can see that it doesn't include NetFX package and as it requires Net-Framework 2.0, I experimented with renaming the Net Framework registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup-Renamed
and 32 bit
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\NET Framework Setup-Renamed
so that it won't be able to detect it. This resulted in displaying a very basic UI: i.e.
I believe , this was displayed due to following markups in my Bundle, but I'm not sure about that
<WixVariable Id="WixMbaPrereqPackageId" Value="Netfx4Full" />
<WixVariable Id="WixMbaPrereqLicenseUrl" Value="NetfxLicense.rtf" />
However, when I clicked "Accept and Install" nothing happened and buttons just got disappeared. That may be because I added no NetFx Package, neither any reference to WixNetFxExtension. (And I will definitely gonna add these and will see results later).
Question: I want to edit this basic UI so if my user try to install it on Windows XP (with no Net Framework), he/she would get the UI as I will design, not this basic one. So how can I edit this basic UI?
I feel, I'm missing some basic thing here, but need some guidance.. would really appreciate any help/guidance.
Regards

Answer 1

I was able to solve this after finding a thread on Wix User's mailing list. Here it is:
customizing burn prerequisite boostrapper image in theme
So this screen is known as Burn Prerequisite and it has a special WixVariable ID. Here is code from my Bootstrapper, depicting the use of my own custom theme for Burn's pre-req screen:
<WixVariable Id="PreqbaThemeXml" Value="..\resources\MbaPrereqTheme.xml" />
<WixVariable Id="PreqbaThemeWxl" Value="..\resources\MbaPrereqTheme.wxl" />
And any resources like Logo.png, Banner.bmp and NetfxLicense.rtf etc which you have referenced in MbaPrereqTheme.xml, would have to be part of Bootstrapper as a PayLoad:
<BootstrapperApplicationRef Id="ManagedBootstrapperApplicationHost" >
<Payload SourceFile="$(var.BootstrapConfigFile)"/>
<Payload SourceFile="$(var.MyBootstrapDll)"/>
<Payload SourceFile="$(env.WIX)\SDK\Microsoft.Deployment.WindowsInstaller.dll"/>
<!-- Following are required as payload and to be used by Pre-Req screen.-->
<Payload SourceFile="..\resources\logo.png"/>
<Payload SourceFile="..\resources\Banner.bmp"/>
<Payload SourceFile="..\resources\NetfxLicense.rtf"/>
</BootstrapperApplicationRef>
And this started working just like as I wished :).
Regards