TreeView path and iter

[johnmb <johnmblackburn googlemail com>]

I am trying to navigate around a treeview and, to do this, I need a valid
path object.  When I use the following two lines :-

    group_iter = m_refTreeModel->get_iter("0");  // Points to first parent
menu item
    group_path = m_refTreeModel->get_path(group_iter);

I get the following error message :-

Gtk-CRITICAL **: gtk_tree_store_get_path: assertion `iter->user_data !=
NULL' failed

I have tried several variations including :-

    group_path = m_refTreeModel->get_path(m_refTreeModel->get_iter("0"));

but all with the same result - any ideas would be very welcome.

Thanks 

John

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