+// common interface for all implementations
+class WXDLLIMPEXP_CORE wxComboWidgetImpl
+
+{
+public :
+ wxComboWidgetImpl() {}
+
+ virtual ~wxComboWidgetImpl() {}
+
+ virtual int GetSelectedItem() const { return -1; };
+ virtual void SetSelectedItem(int WXUNUSED(item)) {};
+
+ virtual int GetNumberOfItems() const { return -1; };
+
+ virtual void InsertItem(int WXUNUSED(pos), const wxString& WXUNUSED(item)) {}
+
+ virtual void RemoveItem(int WXUNUSED(pos)) {}
+
+ virtual void Clear() {}
+
+ virtual wxString GetStringAtIndex(int WXUNUSED(pos)) const { return wxEmptyString; }
+
+ virtual int FindString(const wxString& WXUNUSED(text)) const { return -1; }
+};
+
+//
+// common interface for buttons
+//
+
+class wxButtonImpl
+{
+ public :
+ wxButtonImpl(){}
+ virtual ~wxButtonImpl(){}
+
+ virtual void SetPressedBitmap( const wxBitmap& bitmap ) = 0;
+} ;
+