Index: /home/woo/dev/cpp/qgis/python/core/qgscomposeritem.sip
===================================================================
--- /qgis/python/core/qgscomposeritem.sip	(revision 14732)
+++ /qgis/python/core/qgscomposeritem.sip	(working copy)
@@ -5,8 +5,31 @@
 {
 %TypeHeaderCode
 #include <qgscomposeritem.h>
+#include <qgscomposerlabel.h>
+#include <qgscomposerlegend.h>
+#include <qgscomposermap.h>
+#include <qgscomposerpicture.h>
+#include <qgscomposerscalebar.h>
+#include <qgscomposershape.h>
 %End
 
+%ConvertToSubClassCode
+  if (dynamic_cast<QgsComposerLabel*>(sipCpp) != NULL)
+    sipClass = sipClass_QgsComposerLabel;
+  else if (dynamic_cast<QgsComposerLegend*>(sipCpp) != NULL)
+    sipClass = sipClass_QgsComposerLegend;
+  else if (dynamic_cast<QgsComposerMap*>(sipCpp) != NULL)
+    sipClass = sipClass_QgsComposerMap;	
+  else if (dynamic_cast<QgsComposerPicture*>(sipCpp) != NULL)
+    sipClass = sipClass_QgsComposerPicture;	
+  else if (dynamic_cast<QgsComposerScaleBar*>(sipCpp) != NULL)
+    sipClass = sipClass_QgsComposerScaleBar;	
+  else if (dynamic_cast<QgsComposerShape*>(sipCpp) != NULL)
+    sipClass = sipClass_QgsComposerShape;			
+  else
+    sipClass = 0;
+%End
+
   public:
 
     /**Describes the action (move or resize in different directon) to be done during mouse move*/