Setting data in a list store

[Mike Oliphant <oliphant mp3 com>]

I'm having trouble modifying data in an existing list store. I want to 
modify the selected row of the associated tree view. I can read the list 
store data from the iterator, but any call to list_store_set() on the 
iterator just crashes.

Here is a code snippet:

   if(gtk_tree_selection_get_selected(selection,&model,&iter)) {
     gtk_tree_model_get(model,&iter,TRACKLIST_NUM_COL,&data,-1);

     gtk_list_store_set(my_list_store,&iter,TRACKLIST_RIP_COL,TRUE,-1);
   }

The call to get_tree_model_get() works fine. The call to 
gtk_list_store_set() just crashes. Am I misunderstading something here? 
Any help would be much appreciated.

Mike

-- 
Mike Oliphant                                      oliphant@mp3.com