ImageValueViewer now works and the viewer control is refreshed

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@55 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gui/control/card_viewer.hpp

@@ -23,6 +23,8 @@ class CardViewer : public wxControl, public DataViewer {
 	/// Return the desired size of control
 	virtual wxSize DoGetBestSize() const;
 	
+	virtual void onChange();
+	
   private:
 	DECLARE_EVENT_TABLE();