// so we can index into the wxExpr database and fish out the pointer.
inline void SetClientData(wxObject *data) { client_data = data; }
inline wxObject *GetClientData(void) const { return client_data; }
// so we can index into the wxExpr database and fish out the pointer.
inline void SetClientData(wxObject *data) { client_data = data; }
inline wxObject *GetClientData(void) const { return client_data; }