How to subclass a control?

[Jack Smith]

I've made probably the simplest code possible to take my first step
subclassing a control. It simply creates a subclass but doesn't add anything
to it. Can anyone critique the code?

#include "rb_plugin.h"

static REALclassDefinition myHTMLViewer = {
   kCurrentREALControlVersion,
   "myHTMLViewer",
   "HTMLViewer",
   0,
   0,
   (REALproc) nil, (REALproc) nil,
   nil, 0,
   nil, 0,
   nil, 0,
   nil, 0
};

void PluginEntry() {
   REALRegisterClass(&myHTMLViewer);
}
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