gtk_object_add_arg_type ("GtkCList::row_height",
			   GTK_TYPE_UINT,
			   GTK_ARG_READWRITE,
			   ARG_ROW_HEIGHT);
my guess is that you just need to use "row_height" rather than
"row-height".  I haven't tried it 'cause I don't have any clist code
lying around, but it should be easy for you to test.
	/mailund
-- 
Atheists are people who have no invisible means of support