Why can't you let InstallShield to register it for you?

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>I am using InstallShield - decided to uprgade to the latest express version. It is very nice, excellent GUI and walk-thru to help build the setup package. It's all point and click so very slick.
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>I have a question though. I want to use regsvr32 to register a DLL after the installation is complete. There is a way to run custom actions after the install but I dont know jscript or vbscript. How can I run regsvr32 on a dll in my install folder after the install is done? Any ideas?