[gtkmm-documentation] A build fix.

[Murray Cumming <murrayc src gnome org>]

commit b75a88cc6095c5eb20e07699e345bbfbe86b28b6
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Jan 26 12:04:18 2011 +0100

    A build fix.
    
    	* examples/book/treeview/editable_cells/examplewindow.cc:  Fix another of my
    	mistaken changes of clear() to reset(). This one was a ustring, not a RefPtr.

 ChangeLog                                          |    7 +++++++
 .../book/treeview/editable_cells/examplewindow.cc  |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 793f7de..fe7d4cc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2011-01-26  Murray Cumming  <murrayc murrayc com>
 
+	A build fix.
+
+	* examples/book/treeview/editable_cells/examplewindow.cc:  Fix another of my 
+	mistaken changes of clear() to reset(). This one was a ustring, not a RefPtr.
+
+2011-01-26  Murray Cumming  <murrayc murrayc com>
+
 	Adapt to removal of the Gtk::Range update_policy.
 
 	* examples/book/range_widgets/examplewindow.cc:
diff --git a/examples/book/treeview/editable_cells/examplewindow.cc b/examples/book/treeview/editable_cells/examplewindow.cc
index 27e37b1..e7527c1 100644
--- a/examples/book/treeview/editable_cells/examplewindow.cc
+++ b/examples/book/treeview/editable_cells/examplewindow.cc
@@ -158,7 +158,7 @@ void ExampleWindow::cellrenderer_validated_on_editing_started(
     {
       pEntry->set_text(m_invalid_text_for_retry);
       m_validate_retry = false;
-      m_invalid_text_for_retry.reset();
+      m_invalid_text_for_retry.clear();
     }
   }