Need to get the tree view from the model

[dhk <dhkuhl optonline net>]

What is the most direct way to get the tree view from the tree model?  I 
don't see a function for doing this.

Also, when I went to the source, GtkTreeModel is defined a follows: 
typedef struct _GtkTreeModel GtkTreeModel; /* Dummy typedef */

Why is it called a "Dummy typedef" and why can't I find the structure 
for it?

Thanks,

Dave