I want to set a registry value to a DWORD of 1, unless a optional 
parameter of BAR=1 is specified when the installer runs. I've tried 
variations on what's listed below, but can't get it to work (the listing 
below doesn't work because I'm trying to use an expression in the 
SetProperty element). Can someone tell me the best way to do this?

<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi";>
        <Product Id="ec3c351b-30ac-4185-b6ec-c11c74160fee" Name="
RegValTest" Language="1033" Version="1.0.0.0" Manufacturer="RegValTest" 
UpgradeCode="20916b03-0ec3-4f57-8d41-49e5ffeba1bd">
                <Package InstallerVersion="200" Compressed="yes" />

                <Media Id="1" Cabinet="media1.cab" EmbedCab="yes" />
                <Property Id="FOO" Value="1" />
                <Directory Id="TARGETDIR" Name="SourceDir">
                        <Directory Id="ProgramFilesFolder">
                                <Directory Id="INSTALLLOCATION" Name="
RegValTest">
                                        <Component Id="RegValTest" Guid="
{D2507858-6E11-4770-BA36-2CF6317F90F2}">
                                                <RegistryValue Id="
RegValTest" Root="HKLM" Key="SOFTWARE\RegValTest" Name="RegValTest" Type="
integer" Value="[FOO]" />
                                        </Component>
                                </Directory>
                        </Directory>
                </Directory>

                <Feature Id="ProductFeature" Title="RegValTest" Level="1">
                        <ComponentRef Id="RegValTest" />
                </Feature>
                <SetProperty Id="FOO" After="CostFinalize" Value="NOT 
[BAR]" />
        </Product>
</Wix>

Thanks,
David
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