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/gtk1/combobox.h

@@ -34,7 +34,8 @@ extern WXDLLIMPEXP_BASE const wxChar* wxEmptyString;
 // wxComboBox
 //-----------------------------------------------------------------------------
 
-class WXDLLIMPEXP_CORE wxComboBox : public wxControl, public wxComboBoxBase
+class WXDLLIMPEXP_CORE wxComboBox :
+    public wxWindowWithItems<wxControl, wxComboBoxBase>
 {
 public:
     inline wxComboBox() {}
@@ -154,8 +155,6 @@ public:
     bool IsOwnGtkWindow( GdkWindow *window );
     void DoApplyWidgetStyle(GtkRcStyle *style);
 
-    wxCONTROL_ITEMCONTAINER_CLIENTDATAOBJECT_RECAST
-
     static wxVisualAttributes
     GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);