Get rid of ugly wxCONTROL_ITEMCONTAINER_CLIENTDATAOBJECT_RECAST macro.

Replace it with wxWindowWithItems<> template class which takes care of
disambiguating between the two inherited Get/SetClientXXX() versions and use
it as a base class in all clases that previously used the macro.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68460 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/htmllbox.h

@@ -196,8 +196,8 @@ private:
 #define wxHLB_DEFAULT_STYLE     wxBORDER_SUNKEN
 #define wxHLB_MULTIPLE          wxLB_MULTIPLE
 
-class WXDLLIMPEXP_HTML wxSimpleHtmlListBox : public wxHtmlListBox,
-                                             public wxItemContainer
+class WXDLLIMPEXP_HTML wxSimpleHtmlListBox :
+    public wxWindowWithItems<wxHtmlListBox, wxItemContainer>
 {
     DECLARE_ABSTRACT_CLASS(wxSimpleHtmlListBox)
 public:
@@ -254,9 +254,6 @@ public:
     int GetSelection() const
         { return wxVListBox::GetSelection(); }
 
-    // see ctrlsub.h for more info about this:
-    wxCONTROL_ITEMCONTAINER_CLIENTDATAOBJECT_RECAST
-
 
     // accessing strings
     // -----------------