using subclass as impl ptr, common code in macro because mix-in are not possible in obj-c

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/cocoa/textctrl.mm

@@ -51,12 +51,12 @@
 
 @implementation wxNSTextField
 
-- (void)setImplementation: (wxWidgetImpl *) theImplementation
+- (void)setImplementation: (wxWidgetCocoaImpl *) theImplementation
 {
     impl = theImplementation;
 }
 
-- (wxWidgetImpl*) implementation
+- (wxWidgetCocoaImpl*) implementation
 {
     return impl;
 }