Added wxDataViewProgressCell with native code

for GTK 2.6 and fallbacks otherwise.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37729 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dataview.h

@@ -204,6 +204,7 @@ public:
     
     virtual bool AppendTextColumn( const wxString &label, size_t model_column );
     virtual bool AppendToggleColumn( const wxString &label, size_t model_column );
+    virtual bool AppendProgressColumn( const wxString &label, size_t model_column );
     virtual bool AppendColumn( wxDataViewColumn *col );    
     virtual size_t GetNumberOfColumns();
     virtual bool DeleteColumn( size_t pos );