+#if wxUSE_CHECKLISTBOX
+# define WXLISTBOX_DATACOLUMN_ARG(x) (x->m_hasCheckBoxes ? 1 : 0)
+#else
+# define WXLISTBOX_DATACOLUMN_ARG(x) (0)
+#endif // wxUSE_CHECKLISTBOX
+
+#define WXLISTBOX_DATACOLUMN WXLISTBOX_DATACOLUMN_ARG(this)
+
+// ----------------------------------------------------------------------------
+// helper functions
+// ----------------------------------------------------------------------------
+
+namespace
+{
+
+// Return the entry for the given listbox item.
+//
+// Return value must be released by caller if non-NULL.
+GtkTreeEntry *
+GetEntry(GtkListStore *store, GtkTreeIter *iter, const wxListBox *listbox)
+{
+ GtkTreeEntry* entry;
+ gtk_tree_model_get(GTK_TREE_MODEL(store),
+ iter,
+ WXLISTBOX_DATACOLUMN_ARG(listbox),
+ &entry,
+ -1);
+
+ return entry;
+}
+
+} // anonymous namespace