ENH: add shown method

Code/Visualization/otbPackedWidgetManager.cxx

@@ -157,4 +157,11 @@ PackedWidgetManager
   m_PackedWidget->m_ZoomGroup->label(label);
 }
 
+int
+PackedWidgetManager
+::Shown()
+{
+  m_PackedWidget->m_Window->shown();
+}
+
 }

Code/Visualization/otbPackedWidgetManager.h

@@ -63,6 +63,7 @@ public:
   virtual void SetLabelScrollWidget(const char * label);
   virtual void SetLabelFullWidget(const char * label);
   virtual void SetLabelZoomWidget(const char * label);
+  virtual int Shown();
 
 protected:
   /** Constructor */