[glom] Add missing code from previous commit, lost during rebase.

[Murray Cumming <murrayc src gnome org>]

commit 5b00a220ecb06a7e02343475749fee1a8b00d574
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Jan 4 23:38:11 2012 +0100

    Add missing code from previous commit, lost during rebase.

 glom/mode_data/datawidget/combo.cc |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/glom/mode_data/datawidget/combo.cc b/glom/mode_data/datawidget/combo.cc
index c9cfff7..77c6a1b 100644
--- a/glom/mode_data/datawidget/combo.cc
+++ b/glom/mode_data/datawidget/combo.cc
@@ -62,6 +62,29 @@ ComboGlom::~ComboGlom()
 {
 }
 
+void ComboGlom::on_fixed_cell_data(const Gtk::TreeModel::iterator& iter, Gtk::CellRenderer* cell, guint model_column_index)
+{
+  if(!cell)
+  {
+    std::cerr << G_STRFUNC << ": cell is null." << std::endl;
+    return;
+  }
+
+  if(!iter)
+    return;
+
+  const sharedptr<const LayoutItem>& layout_item = get_layout_item();
+  const sharedptr<const LayoutItem_Field> field = sharedptr<const LayoutItem_Field>::cast_dynamic(layout_item);
+  if(!field)
+    return;
+
+  Gnome::Gda::Value value;
+  Gtk::TreeModel::Row treerow = *iter;
+  treerow->get_value(model_column_index, value);
+
+  set_cell_for_field_value(cell, field, value);
+}
+
 void ComboGlom::set_choices_fixed(const FieldFormatting::type_list_values& list_values)
 {
   ComboChoicesWithTreeModel::set_choices_fixed(list_values);