Can't get self-signed CA cert to request corresponding client cert; Apache

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http://serverfault.com – I'm running Apache 2.2 on Windows, and have mod_ssl working fine for delivering a commercially signed server cert. (A wildcard cert, though I don't think it matters.) I'm trying to get the server, on certain VirtualHosts, to require a client certificate, so I've built an SSLCACertificateFile containing PEMs; as I understand it, that list of signing DNs should be proffered for the client to respond during SSL establishment. I have a StartSSL personal identity certificate, and if I put StartSSL's root cert into the SSLCACertificateFile, the browser (Chrome and IE tested) pops up "select a cer (HowTos)