How can I add a Combobox element when customizing a Theme

[l0rd]

Hi 👋 ,

I am trying to add a 'Combobox' to the 'Install' Page of a BootstrapperApplication (WixStandardBootstrapperApplication.HyperlinkSidebarLicense) using a Theme:

<Theme xmlns="http://wixtoolset.org/schemas/thmutil/2010">
  (...)
  <Page Name="Install">
    (...)
    <Combobox Name="MachineProvider" X="185" Y="250" Width="-11" Height="21" TabStop="yes" FontId="6" Sorted="yes" DropDownList="yes" HideWhenDisabled="yes" Property="MACHINE_PROVIDER">
      <ListItem Text="Hyper-V" Value="hyperv" />
      <ListItem Text="WSL" Value="wsl" />
    <Combobox/>
    (...)
  </Page>
</Theme>

When I do that, the generated setup.exe exits right away without logging anything.

I am using Wix Toolset v3.14.

Is there a way to get more logs when I am running setup.exe?
Is there a command line tool to validate the Theme?
How is ThmViewer.exe supposed to be used (CLI parameters, pre-requisites)? (It exits right away if I try to run it on Windows 11)

Thank you

[l0rd]

Although I didn't get any answer I am closing this one as:

• This doesn't look to be possible using WiX v3
• WiX v4 Thmutil schema includes radio buttons and that's covered by unit tests (radio buttons were what I was looking for in the first place)

[robmen]

We're leaving questions open since they seem to be more discoverable that way. I also marked the answer to help people looking for similar information later.