[wix-users] WixUI

[R]

I cannot seem to get a custom dialog UI running. I've been using

    <UIRef Id="WixUI_Minimal"/>
    <WixVariable Id="WixUILicenseRtf"
Value="$(var.SolutionDir)PronkLicense.rtf" />

with a Reference to the WixUIExtension in Visual Studio 2017.

If I replace that with an exact copy from WixUI_Minimal.wxs (as below), I
get duplicate symbol errors. If I try to remove the extension, I get
missing symbol errors. What am I doing wrong?

<UI Id="WixUI_Minimal">
<TextStyle Id="WixUI_Font_Normal" FaceName="Tahoma" Size="8" />
<TextStyle Id="WixUI_Font_Bigger" FaceName="Tahoma" Size="12" />
<TextStyle Id="WixUI_Font_Title" FaceName="Tahoma" Size="9" Bold="yes" />

<Property Id="DefaultUIFont" Value="WixUI_Font_Normal" />
<Property Id="WixUI_Mode" Value="Minimal" />

<DialogRef Id="ErrorDlg" />
<DialogRef Id="FatalError" />
<DialogRef Id="FilesInUse" />
<DialogRef Id="MsiRMFilesInUse" />
<DialogRef Id="PrepareDlg" />
<DialogRef Id="ProgressDlg" />
<DialogRef Id="ResumeDlg" />
<DialogRef Id="UserExit" />
<DialogRef Id="WelcomeDlg" />
<DialogRef Id="WelcomeEulaDlg" />

<Publish Dialog="ExitDialog" Control="Finish" Event="EndDialog" Value=
"Return" Order="999">1</Publish>

<Publish Dialog="VerifyReadyDlg" Control="Back" Event="NewDialog" Value=
"MaintenanceTypeDlg">1</Publish>

<Publish Dialog="MaintenanceWelcomeDlg" Control="Next" Event="NewDialog"
Value="MaintenanceTypeDlg">1</Publish>

<Publish Dialog="MaintenanceTypeDlg" Control="RepairButton" Event=
"NewDialog" Value="VerifyReadyDlg">1</Publish>
<Publish Dialog="MaintenanceTypeDlg" Control="RemoveButton" Event=
"NewDialog" Value="VerifyReadyDlg">1</Publish>
<Publish Dialog="MaintenanceTypeDlg" Control="Back" Event="NewDialog" Value=
"MaintenanceWelcomeDlg">1</Publish>

<Publish Dialog="WelcomeDlg" Control="Next" Event="NewDialog" Value=
"VerifyReadyDlg">Installed AND PATCH</Publish>
<Publish Dialog="VerifyReadyDlg" Control="Back" Event="NewDialog" Value=
"WelcomeDlg" Order="2">Installed AND PATCH</Publish>

<InstallUISequence>
<Show Dialog="WelcomeDlg" Before="WelcomeEulaDlg">Installed AND PATCH</Show>
<Show Dialog="WelcomeEulaDlg" Before="ProgressDlg">NOT Installed</Show>
</InstallUISequence>

<Property Id="ARPNOMODIFY" Value="1" />
</UI>

<UIRef Id="WixUI_Common" />