TreeVieW Gtk

static void
append_item(GtkWidget *widget, gpointer entry,gpointer selection)        
{
  GtkTreeStore *treestore;
  GtkTreeIter  child,iter;

  GtkTreeModel *model;

  const char *str = gtk_entry_get_text(entry);                           

  treestore = GTK_TREE_STORE(gtk_tree_view_get_model(                     
       GTK_TREE_VIEW(view)));
  model = gtk_tree_view_get_model (GTK_TREE_VIEW (view));
  
  GtkTreeSelection *sel = gtk_tree_view_get_selection (GTK_TREE_VIEW(view));
  if (gtk_tree_selection_get_selected(GTK_TREE_SELECTION(sel),      
      &model, &iter))
  {
    gtk_tree_store_append(treestore, &child, &iter);                        
    gtk_tree_store_set(treestore, &child, COLUMN, str,-1);                   
  }
}

...

int main (int argc, char *argv[])

{

  GtkWidget *window;
  GtkWidget *sw;
  //GtkWidget *view;   
  GtkWidget *remove;
  GtkWidget *add;