halfway rendered page?

Yasunori <[email protected]> Mon, 31 Oct 2011 22:20:43 -0700 (PDT)
Newsgroups gmane.comp.mozilla.devel.embedding
Organization http://groups.google.com
Message-ID <ebd66641-f82d-48fb-ab97-db08fbeee921@u10g2000prl.googlegroups.com>
Hi.
I'm developing original embedded browser using gtkmozembed and gtkmm.
(OS is Debian6 64bit and I installed xulrunner-1.9.1 package.)

Some time I get halfway rendered page by gtk_moz_embed_load_url().
Just like CSS load failed.

I don't know why the page looks like halfway rendered.
First of all to investigate a cause, I wan't to handle errors for
gtk_moz_embed_load_url().

How can I do that?