cocoa doesn't need system framework - string conversion for cocoa - focus for cocoa - a bit of change for string unit tests for new functionality

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29780 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/NSView.h

@@ -16,6 +16,7 @@
 #include "wx/cocoa/ObjcAssociate.h"
 
 typedef struct _NSRect NSRect;
+class wxWindow;
 
 WX_DECLARE_OBJC_HASHMAP(NSView);
 class wxCocoaNSView
@@ -28,6 +29,8 @@ public:
 protected:
     static void *sm_cocoaObserver;
 public:
+    virtual wxWindow* GetWxWindow() const
+    {	return NULL;	}
     virtual void Cocoa_FrameChanged(void) = 0;
     virtual bool Cocoa_drawRect(const NSRect &rect)
     {   return false; }