Problem with child rows on Treeviews

[Arthur Maciel <arthurmaciel gmail com>]

Hi there. I get the following compilation error when building a treeview application. If I remove the children rows [which means the lines that contain m_refTreeModel->append(row.children())] it compiles perfectly (but is not a TreeModel anymore):

Error:
---------------------------------------------------------------------------------------------------
application.cpp: In constructor `Example::Application::Application()':
application.cpp:73: error: no matching function for call to `Gtk::ListStore::
   append(const Gtk::TreeNodeChildren&)'
/usr/include/gtkmm-2.4/gtkmm/liststore.h:173: error: candidates are:
   Gtk::TreeIter Gtk::ListStore::append()
application.cpp:77: error: no matching function for call to `Gtk::ListStore::
   append(const Gtk::TreeNodeChildren&)'
/usr/include/gtkmm-2.4/gtkmm/liststore.h:173: error: candidates are:
   Gtk::TreeIter Gtk::ListStore::append()
application.cpp:89: error: no matching function for call to `Gtk::ListStore::
   append(const Gtk::TreeNodeChildren&)'
/usr/include/gtkmm-2.4/gtkmm/liststore.h:173: error: candidates are:
   Gtk::TreeIter Gtk::ListStore::append()
make: ** [typical-application.o] Erro 1
---------------------------------------------------------------------------------------------------

Code:
---------------------------------------------------------------------------------------------------
//Fill the TreeView's model
    Gtk::TreeModel::Row row = *(m_refTreeModel->append());
    row[m_Columns.m_col_id] = 1;
    row[m_Columns.m_col_name] = "Billy Bob";

    Gtk::TreeModel::Row childrow = *(m_refTreeModel->append(row.children()));
    childrow[m_Columns.m_col_id] = 11;
    childrow[m_Columns.m_col_name] = "Billy Bob Junior";

    childrow = *(m_refTreeModel->append(row.children()));
    childrow[m_Columns.m_col_id] = 12;
    childrow[m_Columns.m_col_name] = "Sue Bob";

    row = *(m_refTreeModel->append());
    row[m_Columns.m_col_id] = 2;
    row[m_Columns.m_col_name] = "Joey Jojo";

    row = *(m_refTreeModel->append());
    row[m_Columns.m_col_id] = 3;
    row[m_Columns.m_col_name] = "Rob McRoberts";

    childrow = *(m_refTreeModel->append(row.children()));
    childrow[m_Columns.m_col_id] = 31;
    childrow[m_Columns.m_col_name] = "Xavier McRoberts";
---------------------------------------------------------------------------------------------------

Any idea on that would be really useful.
Thank you and have a Happy New Year.

Arthur Maciel