title: How to set ProductCode for InstallShield instance transforms
body: <p>I can set the product code for a single instance installer with MSBuild like this:</p>
  
  <pre><code>&lt;ItemGroup&gt;
      &lt;InstallShieldPropertyOverrides Include="{$(Guid)}"&gt;
           &lt;Property&gt;ProductCode&lt;/Property&gt;
      &lt;/InstallShieldPropertyOverrides&gt;
  &lt;/ItemGroup&gt;
  </code></pre>
  
  <p>How do you set the instance 1 product code? 
  Is this possible?
  If not, then what is an appropriate way to set the product code on each instance transform when using automated builds?</p>