SetInitialBestSize changes for wxMac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27132 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/listbox.cpp

@@ -246,6 +246,8 @@ bool wxListBox::Create(wxWindow *parent, wxWindowID id,
         Append( choices[i] ) ;
     }
 
+    SetBestSize(size);   // Needed because it is a wxControlWithItems
+    
     return TRUE;
 }