How to display different nodes with different styles in GtkTreeView?

[包 必显 <phoebebbx hotmail com>]

Hi:
 Everybody!Nowdays,I'am developping an application with gtk+,and in the 
user interface,there needs a GtkTreeView to display all files and folders 
in a file system.When display folder,it just needs a pixbuf and 
cellrenderertext to display the folder's name,while when displaying the 
file,there needs an additional checkbox besides the pixbuf and 
cellrenderertext,and how to implement this treeview?

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