problem with treeview sorting

[Doug McLain <dougmclain cayf org>]

Using the code in examples/book/treeview/list, I added the following to 
the constructor:

  for(guint i = 0; i < 4; i++)
  {
    Gtk::TreeView::Column* pColumn = m_TreeView.get_column(i);
    pColumn->set_reorderable();
	pColumn->set_sort_column(i);
  }


All columns sort correctly except for the column c reated with 
append_column_numeric():

m_TreeView.append_column_numeric("Formatted number", 
m_Columns.m_col_number, "%010d" /* 10 digits, using leading zeroes. */);


When clicking on this column,  I get:

Gtk-WARNING **: Attempting to sort on invalid type glibmm__CustomBoxed_s

Doug
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