void remove_selected_items ( GtkTreeView *treeview )
{
    GtkTreeSelection *selection = gtk_tree_view_get_selection ( treeview );
    GtkListStore *store;
    GtkTreeModel *model;
    GtkTreeIter iter;
   
    if (gtk_tree_selection_count_selected_rows(selection) == 0)
        return;
   
    GList *list = gtk_tree_selection_get_selected_rows( selection, &model );
    store = GTK_LIST_STORE ( model );
   
    int nRemoved = 0;
    while(list) {
        int ipath = atoi(gtk_tree_path_to_string(list->data));
        ipath-=nRemoved;
        GString *fixed_path = g_string_new("");
        g_string_printf(fixed_path, "%d", ipath);
       
        GtkTreePath *path = gtk_tree_path_new_from_string(fixed_path->str);
        g_string_free(fixed_path, TRUE);
       
        if (path) {
            //g_printf("%d\n", ipath);
            if ( gtk_tree_model_get_iter ( model, &iter, path) ) { // get iter from specified path
                gtk_list_store_remove ( store, &iter ); // remove item
                nRemoved++;   
            }
            else { // invalid path
                g_error("Error!!!\n");
            }
            gtk_tree_path_free (path);
        }
        else {
            g_error("Error!!!\n");
        }
        list = list->next;
    }
    g_list_foreach (list, (GFunc)gtk_tree_path_free, NULL);
    g_list_free (list);
}

void
on_btnRemoveSelectedItems_clicked (GtkButton *button, gpointer user_data)
{
    /*=====================================
    * This is optional. Depends on how you are using this code. */
    GtkTreeView *treeview = GTK_TREE_VIEW (lookup_widget ( myWindow, "myTreeView" ));
    /*=====================================*/

    // send a reference of your tree view
    remove_selected_items ( treeview );
}