Index: src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.cpp
===================================================================
--- src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.cpp	(revision 12477)
+++ src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.cpp	(working copy)
@@ -61,6 +61,7 @@
   connect( btnAddCategories, SIGNAL( clicked() ), this, SLOT( addCategories() ) );
   connect( btnDeleteCategory, SIGNAL( clicked() ), this, SLOT( deleteCategory() ) );
   connect( btnDeleteAllCategories, SIGNAL( clicked() ), this, SLOT( deleteAllCategories() ) );
+  connect( m, SIGNAL( itemChanged( QStandardItem * ) ), this, SLOT( changeCurrentValue( QStandardItem * ) ) );
 
   // update GUI from renderer
   updateUiFromRenderer();
@@ -330,3 +331,12 @@
   populateCategories();
 }
 
+void QgsCategorizedSymbolRendererV2Widget::changeCurrentValue( QStandardItem * item )
+{
+  if ( item->column() == 1 )
+  {
+    QString label = item->text();
+    int idx = item->row();
+    mRenderer->updateCategoryLabel( idx, label );
+  }
+}
Index: src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.h
===================================================================
--- src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.h	(revision 12477)
+++ src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.h	(working copy)
@@ -2,6 +2,7 @@
 #define QGSCATEGORIZEDSYMBOLRENDERERV2WIDGET_H
 
 #include "qgsrendererv2widget.h"
+#include <QStandardItem>
 
 class QgsCategorizedSymbolRendererV2;
 
@@ -27,6 +28,7 @@
     void addCategories();
     void deleteCategory();
     void deleteAllCategories();
+    void changeCurrentValue( QStandardItem * item );
 
   protected: